diff --git a/command.c b/command.c
index 5d02652..4a1da4d 100644
--- a/command.c
+++ b/command.c
@@ -515,9 +515,9 @@ static errInfo_t errInfo[]=
    {PI_NOT_SERVO_GPIO   , "GPIO is not in use for servo pulses"},
    {PI_NOT_HCLK_GPIO    , "GPIO has no hardware clock"},
    {PI_NOT_HPWM_GPIO    , "GPIO has no hardware PWM"},
-   {PI_BAD_HPWM_FREQ    , "hardware PWM frequency not 1-125M"},
+   {PI_BAD_HPWM_FREQ    , "invalid hardware PWM frequency"},
    {PI_BAD_HPWM_DUTY    , "hardware PWM dutycycle not 0-1M"},
-   {PI_BAD_HCLK_FREQ    , "hardware clock frequency not 4689-250M"},
+   {PI_BAD_HCLK_FREQ    , "invalid hardware clock frequency"},
    {PI_BAD_HCLK_PASS    , "need password to use hardware clock 1"},
    {PI_HPWM_ILLEGAL     , "illegal, PWM in use for main clock"},
    {PI_BAD_DATABITS     , "serial data bits not 1-32"},
diff --git a/pigpio.3 b/pigpio.3
index 54e23e1..f8c1675 100644
--- a/pigpio.3
+++ b/pigpio.3
@@ -5585,7 +5585,7 @@ Frequencies above 30MHz are unlikely to work.
 .EX
    gpio: see description
 .br
-clkfreq: 0 (off) or 4689-250000000 (250M)
+clkfreq: 0 (off) or 4689-250M (13184-375M for the BCM2711)
 .br
 
 .EE
@@ -5669,7 +5669,7 @@ main clock defaults to PCM but may be overridden by a call to
 .EX
    gpio: see description
 .br
-PWMfreq: 0 (off) or 1-125000000 (125M)
+PWMfreq: 0 (off) or 1-125M (1-187.5M for the BCM2711)
 .br
 PWMduty: 0 (off) to 1000000 (1M)(fully on)
 .br
@@ -5726,18 +5726,18 @@ The GPIO must be one of the following.
 
 .br
 The actual number of steps beween off and fully on is the
-integral part of 250 million divided by PWMfreq.
+integral part of 250M/PWMfreq (375M/PWMfreq for the BCM2711).
 
 .br
 
 .br
-The actual frequency set is 250 million / steps.
+The actual frequency set is 250M/steps (375M/steps for the BCM2711).
 
 .br
 
 .br
-There will only be a million steps for a PWMfreq of 250.
-Lower frequencies will have more steps and higher
+There will only be a million steps for a PWMfreq of 250 (375 for
+the BCM2711). Lower frequencies will have more steps and higher
 frequencies will have fewer steps.  PWMduty is
 automatically scaled to take this into account.
 
@@ -7978,7 +7978,7 @@ A single character, an 8 bit quantity able to store 0-255.
 
 .br
 
-.IP "\fBclkfreq\fP: 4689-250M" 0
+.IP "\fBclkfreq\fP: 4689-250M (13184-375M for the BCM2711)" 0
 
 .br
 
@@ -7994,6 +7994,8 @@ PI_HW_CLK_MIN_FREQ 4689
 .br
 PI_HW_CLK_MAX_FREQ 250000000
 .br
+PI_HW_CLK_MAX_FREQ_2711 375000000
+.br
 
 .EE
 
@@ -9057,7 +9059,7 @@ PI_HW_PWM_RANGE 1000000
 
 .br
 
-.IP "\fBPWMfreq\fP: 5-250K" 0
+.IP "\fBPWMfreq\fP: 1-125M (1-187.5M for the BCM2711)" 0
 The hardware PWM frequency.
 
 .br
@@ -9069,6 +9071,8 @@ PI_HW_PWM_MIN_FREQ 1
 .br
 PI_HW_PWM_MAX_FREQ 125000000
 .br
+PI_HW_PWM_MAX_FREQ_2711 187500000
+.br
 
 .EE
 
@@ -10263,11 +10267,11 @@ A 16-bit word value.
 .br
 #define PI_NOT_HPWM_GPIO    -95 // GPIO has no hardware PWM
 .br
-#define PI_BAD_HPWM_FREQ    -96 // hardware PWM frequency not 1-125M
+#define PI_BAD_HPWM_FREQ    -96 // invalid hardware PWM frequency
 .br
 #define PI_BAD_HPWM_DUTY    -97 // hardware PWM dutycycle not 0-1M
 .br
-#define PI_BAD_HCLK_FREQ    -98 // hardware clock frequency not 4689-250M
+#define PI_BAD_HCLK_FREQ    -98 // invalid hardware clock frequency
 .br
 #define PI_BAD_HCLK_PASS    -99 // need password to use hardware clock 1
 .br
diff --git a/pigpio.c b/pigpio.c
index 5187078..a41a3d7 100644
--- a/pigpio.c
+++ b/pigpio.c
@@ -511,6 +511,7 @@ bit 0 READ_LAST_NOT_SET_ERROR
 #define CLK_CTL_SRC_PLLD 6
 
 #define CLK_OSC_FREQ        19200000
+#define CLK_OSC_FREQ_2711   54000000
 #define CLK_PLLD_FREQ      500000000
 #define CLK_PLLD_FREQ_2711 750000000
 
@@ -1219,7 +1220,11 @@ static volatile uint32_t pi_dram_bus   = 0x40000000;
 static volatile uint32_t pi_mem_flag   = 0x0C;
 static volatile uint32_t pi_ispi       = 0;
 static volatile uint32_t pi_is_2711    = 0;
+static volatile uint32_t clk_osc_freq  = CLK_OSC_FREQ;
 static volatile uint32_t clk_plld_freq = CLK_PLLD_FREQ;
+static volatile uint32_t hw_pwm_max_freq = PI_HW_PWM_MAX_FREQ;
+static volatile uint32_t hw_clk_min_freq = PI_HW_CLK_MIN_FREQ;
+static volatile uint32_t hw_clk_max_freq = PI_HW_CLK_MAX_FREQ;
 
 static int libInitialised = 0;
 
@@ -12668,7 +12673,7 @@ int gpioHardwareClock(unsigned gpio, unsigned frequency)
    int cctl[] = {CLK_GP0_CTL, CLK_GP1_CTL, CLK_GP2_CTL};
    int cdiv[] = {CLK_GP0_DIV, CLK_GP1_DIV, CLK_GP2_DIV};
    int csrc[CLK_SRCS] = {CLK_CTL_SRC_OSC, CLK_CTL_SRC_PLLD};
-   uint32_t cfreq[CLK_SRCS]={CLK_OSC_FREQ, clk_plld_freq};
+   uint32_t cfreq[CLK_SRCS]={clk_osc_freq, clk_plld_freq};
    unsigned clock, mode, mash;
    int password = 0;
    double f;
@@ -12688,11 +12693,12 @@ int gpioHardwareClock(unsigned gpio, unsigned frequency)
    if (!clkDef[gpio])
       SOFT_ERROR(PI_NOT_HCLK_GPIO, "bad gpio for clock (%d)", gpio);
 
-   if (((frequency < PI_HW_CLK_MIN_FREQ) ||
-        (frequency > PI_HW_CLK_MAX_FREQ)) &&
+   if (((frequency < hw_clk_min_freq) ||
+        (frequency > hw_clk_max_freq)) &&
         (frequency))
       SOFT_ERROR(PI_BAD_HCLK_FREQ,
-         "bad hardware clock frequency (%d)", frequency);
+         "bad hardware clock frequency %d-%d: (%d)",
+            hw_clk_min_freq, hw_clk_max_freq, frequency);
 
    clock = (clkDef[gpio] >> 4) & 3;
 
@@ -12727,7 +12733,8 @@ int gpioHardwareClock(unsigned gpio, unsigned frequency)
       else
       {
          SOFT_ERROR(PI_BAD_HCLK_FREQ,
-            "bad hardware clock frequency (%d)", frequency);
+            "bad hardware clock frequency %d-%d: (%d)",
+               hw_clk_min_freq, hw_clk_max_freq, frequency);
       }
    }
    else
@@ -12766,10 +12773,12 @@ int gpioHardwarePWM(
       SOFT_ERROR(PI_BAD_HPWM_DUTY, "bad PWM dutycycle (%d)", dutycycle);
 
    if (((frequency < PI_HW_PWM_MIN_FREQ) ||
-        (frequency > PI_HW_PWM_MAX_FREQ)) &&
+        (frequency > hw_pwm_max_freq)) &&
         (frequency))
       SOFT_ERROR(PI_BAD_HPWM_FREQ,
-         "bad hardware PWM frequency (%d)", frequency);
+         "bad hardware PWM frequency %d-%d: (%d)",
+            PI_HW_PWM_MIN_FREQ, hw_pwm_max_freq, frequency);
+
 
    if (gpioCfg.clockPeriph == PI_CLOCK_PWM)
       SOFT_ERROR(PI_HPWM_ILLEGAL, "illegal, PWM in use for main clock");
@@ -13477,7 +13486,12 @@ unsigned gpioHardwareRevision(void)
                      pi_mem_flag  = 0x04;
                      pi_is_2711   = 1;
                      pi_ispi      = 1;
+                     clk_osc_freq = CLK_OSC_FREQ_2711;
                      clk_plld_freq = CLK_PLLD_FREQ_2711;
+                     hw_pwm_max_freq = PI_HW_PWM_MAX_FREQ_2711;
+                     hw_clk_min_freq = PI_HW_CLK_MIN_FREQ_2711;
+                     hw_clk_max_freq = PI_HW_CLK_MAX_FREQ_2711;
+
                      fclose(filp);
                      if (!gpioMaskSet)
                      {
diff --git a/pigpio.h b/pigpio.h
index 77164bd..72852d5 100644
--- a/pigpio.h
+++ b/pigpio.h
@@ -30,7 +30,7 @@ For more information, please refer to <http://unlicense.org/>
 #include <stdint.h>
 #include <pthread.h>
 
-#define PIGPIO_VERSION 6906
+#define PIGPIO_VERSION 6909
 
 /*TEXT
 
@@ -610,13 +610,16 @@ typedef void *(gpioThreadFunc_t) (void *);
 /* hardware PWM */
 
 #define PI_HW_PWM_MIN_FREQ 1
-#define PI_HW_PWM_MAX_FREQ 125000000
+#define PI_HW_PWM_MAX_FREQ      125000000
+#define PI_HW_PWM_MAX_FREQ_2711 187500000
 #define PI_HW_PWM_RANGE 1000000
 
 /* hardware clock */
 
-#define PI_HW_CLK_MIN_FREQ 4689
-#define PI_HW_CLK_MAX_FREQ 250000000
+#define PI_HW_CLK_MIN_FREQ       4689
+#define PI_HW_CLK_MIN_FREQ_2711 13184
+#define PI_HW_CLK_MAX_FREQ      250000000
+#define PI_HW_CLK_MAX_FREQ_2711 375000000
 
 #define PI_NOTIFY_SLOTS  32
 
@@ -3982,7 +3985,7 @@ Frequencies above 30MHz are unlikely to work.
 
 . .
    gpio: see description
-clkfreq: 0 (off) or 4689-250000000 (250M)
+clkfreq: 0 (off) or 4689-250M (13184-375M for the BCM2711)
 . .
 
 Returns 0 if OK, otherwise PI_BAD_GPIO, PI_NOT_HCLK_GPIO,
@@ -4027,7 +4030,7 @@ main clock defaults to PCM but may be overridden by a call to
 
 . .
    gpio: see description
-PWMfreq: 0 (off) or 1-125000000 (125M)
+PWMfreq: 0 (off) or 1-125M (1-187.5M for the BCM2711)
 PWMduty: 0 (off) to 1000000 (1M)(fully on)
 . .
 
@@ -4054,12 +4057,12 @@ The GPIO must be one of the following.
 . .
 
 The actual number of steps beween off and fully on is the
-integral part of 250 million divided by PWMfreq.
+integral part of 250M/PWMfreq (375M/PWMfreq for the BCM2711).
 
-The actual frequency set is 250 million / steps.
+The actual frequency set is 250M/steps (375M/steps for the BCM2711).
 
-There will only be a million steps for a PWMfreq of 250.
-Lower frequencies will have more steps and higher
+There will only be a million steps for a PWMfreq of 250 (375 for
+the BCM2711). Lower frequencies will have more steps and higher
 frequencies will have fewer steps.  PWMduty is
 automatically scaled to take this into account.
 D*/
@@ -5312,13 +5315,14 @@ char::
 
 A single character, an 8 bit quantity able to store 0-255.
 
-clkfreq::4689-250M
+clkfreq::4689-250M (13184-375M for the BCM2711)
 
 The hardware clock frequency.
 
 . .
 PI_HW_CLK_MIN_FREQ 4689
 PI_HW_CLK_MAX_FREQ 250000000
+PI_HW_CLK_MAX_FREQ_2711 375000000
 . .
 
 count::
@@ -5770,12 +5774,13 @@ The hardware PWM dutycycle.
 PI_HW_PWM_RANGE 1000000
 . .
 
-PWMfreq::5-250K
+PWMfreq::1-125M (1-187.5M for the BCM2711)
 The hardware PWM frequency.
 
 . .
 PI_HW_PWM_MIN_FREQ 1
 PI_HW_PWM_MAX_FREQ 125000000
+PI_HW_PWM_MAX_FREQ_2711 187500000
 . .
 
 range::25-40000
@@ -6379,9 +6384,9 @@ after this command is issued.
 #define PI_NOT_SERVO_GPIO   -93 // GPIO is not in use for servo pulses
 #define PI_NOT_HCLK_GPIO    -94 // GPIO has no hardware clock
 #define PI_NOT_HPWM_GPIO    -95 // GPIO has no hardware PWM
-#define PI_BAD_HPWM_FREQ    -96 // hardware PWM frequency not 1-125M
+#define PI_BAD_HPWM_FREQ    -96 // invalid hardware PWM frequency
 #define PI_BAD_HPWM_DUTY    -97 // hardware PWM dutycycle not 0-1M
-#define PI_BAD_HCLK_FREQ    -98 // hardware clock frequency not 4689-250M
+#define PI_BAD_HCLK_FREQ    -98 // invalid hardware clock frequency
 #define PI_BAD_HCLK_PASS    -99 // need password to use hardware clock 1
 #define PI_HPWM_ILLEGAL    -100 // illegal, PWM in use for main clock
 #define PI_BAD_DATABITS    -101 // serial data bits not 1-32
diff --git a/pigpio.py b/pigpio.py
index d66485d..4da6171 100644
--- a/pigpio.py
+++ b/pigpio.py
@@ -300,7 +300,7 @@ import threading
 import os
 import atexit
 
-VERSION = "1.43"
+VERSION = "1.44"
 
 exceptions = True
 
@@ -788,9 +788,9 @@ _errors=[
    [PI_NOT_SERVO_GPIO    , "GPIO is not in use for servo pulses"],
    [PI_NOT_HCLK_GPIO     , "GPIO has no hardware clock"],
    [PI_NOT_HPWM_GPIO     , "GPIO has no hardware PWM"],
-   [PI_BAD_HPWM_FREQ     , "hardware PWM frequency not 1-125M"],
+   [PI_BAD_HPWM_FREQ     , "invalid hardware PWM frequency"],
    [PI_BAD_HPWM_DUTY     , "hardware PWM dutycycle not 0-1M"],
-   [PI_BAD_HCLK_FREQ     , "hardware clock frequency not 4689-250M"],
+   [PI_BAD_HCLK_FREQ     , "invalid hardware clock frequency"],
    [PI_BAD_HCLK_PASS     , "need password to use hardware clock 1"],
    [PI_HPWM_ILLEGAL      , "illegal, PWM in use for main clock"],
    [PI_BAD_DATABITS      , "serial data bits not 1-32"],
@@ -1909,7 +1909,7 @@ class pi():
       Frequencies above 30MHz are unlikely to work.
 
          gpio:= see description
-      clkfreq:= 0 (off) or 4689-250000000 (250M)
+      clkfreq:= 0 (off) or 4689-250M (13184-375M for the BCM2711)
 
 
       Returns 0 if OK, otherwise PI_NOT_PERMITTED, PI_BAD_GPIO,
@@ -1959,7 +1959,7 @@ class pi():
       pigpio daemon is started (option -t).
 
          gpio:= see descripton
-      PWMfreq:= 0 (off) or 1-125000000 (125M).
+      PWMfreq:= 0 (off) or 1-125M (1-187.5M for the BCM2711).
       PWMduty:= 0 (off) to 1000000 (1M)(fully on).
 
       Returns 0 if OK, otherwise PI_NOT_PERMITTED, PI_BAD_GPIO,
@@ -1985,14 +1985,15 @@ class pi():
       . .
 
       The actual number of steps beween off and fully on is the
-      integral part of 250 million divided by PWMfreq.
+      integral part of 250M/PWMfreq (375M/PWMfreq for the BCM2711).
 
-      The actual frequency set is 250 million / steps.
+      The actual frequency set is 250M/steps (375M/steps
+      for the BCM2711).
 
-      There will only be a million steps for a PWMfreq of 250.
-      Lower frequencies will have more steps and higher
-      frequencies will have fewer steps.  PWMduty is
-      automatically scaled to take this into account.
+      There will only be a million steps for a PWMfreq of 250
+      (375 for the BCM2711). Lower frequencies will have more
+      steps and higher frequencies will have fewer steps.
+      PWMduty is automatically scaled to take this into account.
 
       ...
       pi.hardware_PWM(18, 800, 250000) # 800Hz 25% dutycycle
@@ -5184,7 +5185,7 @@ def xref():
    byte_val: 0-255
    A whole number.
 
-   clkfreq: 4689-250M
+   clkfreq: 4689-250M (13184-375M for the BCM2711)
    The hardware clock frequency.
 
    connected:
@@ -5340,6 +5341,8 @@ def xref():
    PI_NOT_SPI_GPIO = -142
    PI_BAD_EVENT_ID = -143
    PI_CMD_INTERRUPTED = -144
+   PI_NOT_ON_BCM2711   = -145
+   PI_ONLY_ON_BCM2711  = -146
    . .
 
    event:0-31
@@ -5532,7 +5535,7 @@ def xref():
    PWMduty: 0-1000000 (1M)
    The hardware PWM dutycycle.
 
-   PWMfreq: 1-125000000 (125M)
+   PWMfreq: 1-125M (1-187.5M for the BCM2711)
    The hardware PWM frequency.
 
    range_: 25-40000
diff --git a/pigpiod_if2.3 b/pigpiod_if2.3
index f39dfa4..2354d88 100644
--- a/pigpiod_if2.3
+++ b/pigpiod_if2.3
@@ -1412,7 +1412,7 @@ Frequencies above 30MHz are unlikely to work.
 .br
      gpio: see description
 .br
-frequency: 0 (off) or 4689-250000000 (250M)
+frequency: 0 (off) or 4689-250M (13184-375M for the BCM2711)
 .br
 
 .EE
@@ -1498,7 +1498,7 @@ daemon is started (option -t).
 .br
    gpio: see descripton
 .br
-PWMfreq: 0 (off) or 1-125000000 (125M)
+PWMfreq: 0 (off) or 1-125M (1-187.5M for the BCM2711)
 .br
 PWMduty: 0 (off) to 1000000 (1M)(fully on)
 .br
@@ -1556,18 +1556,18 @@ The GPIO must be one of the following.
 
 .br
 The actual number of steps beween off and fully on is the
-integral part of 250 million divided by PWMfreq.
+integral part of 250M/PWMfreq (375M/PWMfreq for the BCM2711).
 
 .br
 
 .br
-The actual frequency set is 250 million / steps.
+The actual frequency set is 250M/steps (375M/steps for the BCM2711).
 
 .br
 
 .br
-There will only be a million steps for a PWMfreq of 250.
-Lower frequencies will have more steps and higher
+There will only be a million steps for a PWMfreq of 250 (375 for
+the BCM2711). Lower frequencies will have more steps and higher
 frequencies will have fewer steps.  PWMduty is
 automatically scaled to take this into account.
 
@@ -6294,7 +6294,7 @@ A single character, an 8 bit quantity able to store 0-255.
 
 .br
 
-.IP "\fBclkfreq\fP: 4689-250000000 (250M)" 0
+.IP "\fBclkfreq\fP: 4689-250M (13184-375M for the BCM2711)" 0
 The hardware clock frequency.
 
 .br
@@ -6972,7 +6972,7 @@ The hardware PWM dutycycle.
 
 .br
 
-.IP "\fBPWMfreq\fP: 1-125000000 (125M)" 0
+.IP "\fBPWMfreq\fP: 1-125M (1-187.5M for the BCM2711)" 0
 The hardware PWM frequency.
 
 .br
@@ -6984,6 +6984,8 @@ The hardware PWM frequency.
 .br
 #define PI_HW_PWM_MAX_FREQ 125000000
 .br
+#define PI_HW_PWM_MAX_FREQ_2711 187500000
+.br
 
 .EE
 
diff --git a/pigpiod_if2.c b/pigpiod_if2.c
index fa97d31..cd343c0 100644
--- a/pigpiod_if2.c
+++ b/pigpiod_if2.c
@@ -25,7 +25,7 @@ OTHER DEALINGS IN THE SOFTWARE.
 For more information, please refer to <http://unlicense.org/>
 */
 
-/* PIGPIOD_IF2_VERSION 14 */
+/* PIGPIOD_IF2_VERSION 15 */
 
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/pigpiod_if2.h b/pigpiod_if2.h
index 4cd7cf8..b63dbc7 100644
--- a/pigpiod_if2.h
+++ b/pigpiod_if2.h
@@ -30,7 +30,7 @@ For more information, please refer to <http://unlicense.org/>
 
 #include "pigpio.h"
 
-#define PIGPIOD_IF2_VERSION 14
+#define PIGPIOD_IF2_VERSION 15
 
 /*TEXT
 
@@ -1049,7 +1049,7 @@ Frequencies above 30MHz are unlikely to work.
 . .
        pi: >=0 (as returned by [*pigpio_start*]).
      gpio: see description
-frequency: 0 (off) or 4689-250000000 (250M)
+frequency: 0 (off) or 4689-250M (13184-375M for the BCM2711)
 . .
 
 Returns 0 if OK, otherwise PI_NOT_PERMITTED, PI_BAD_GPIO,
@@ -1096,7 +1096,7 @@ daemon is started (option -t).
 . .
      pi: >=0 (as returned by [*pigpio_start*]).
    gpio: see descripton
-PWMfreq: 0 (off) or 1-125000000 (125M)
+PWMfreq: 0 (off) or 1-125M (1-187.5M for the BCM2711)
 PWMduty: 0 (off) to 1000000 (1M)(fully on)
 . .
 
@@ -1124,12 +1124,12 @@ The GPIO must be one of the following.
 . .
 
 The actual number of steps beween off and fully on is the
-integral part of 250 million divided by PWMfreq.
+integral part of 250M/PWMfreq (375M/PWMfreq for the BCM2711).
 
-The actual frequency set is 250 million / steps.
+The actual frequency set is 250M/steps (375M/steps for the BCM2711).
 
-There will only be a million steps for a PWMfreq of 250.
-Lower frequencies will have more steps and higher
+There will only be a million steps for a PWMfreq of 250 (375 for
+the BCM2711). Lower frequencies will have more steps and higher
 frequencies will have fewer steps.  PWMduty is
 automatically scaled to take this into account.
 D*/
@@ -3749,7 +3749,7 @@ typedef void (*CBFuncEx_t)
 char::
 A single character, an 8 bit quantity able to store 0-255.
 
-clkfreq::4689-250000000 (250M)
+clkfreq::4689-250M (13184-375M for the BCM2711)
 The hardware clock frequency.
 
 count::
@@ -4053,12 +4053,13 @@ The hardware PWM dutycycle.
 #define PI_HW_PWM_RANGE 1000000
 . .
 
-PWMfreq::1-125000000 (125M)
+PWMfreq::1-125M (1-187.5M for the BCM2711)
 The hardware PWM frequency.
 
 . .
 #define PI_HW_PWM_MIN_FREQ 1
 #define PI_HW_PWM_MAX_FREQ 125000000
+#define PI_HW_PWM_MAX_FREQ_2711 187500000
 . .
 
 range::25-40000
diff --git a/pigs.1 b/pigs.1
index 0780ab5..3926b64 100644
--- a/pigs.1
+++ b/pigs.1
@@ -1705,11 +1705,11 @@ $ pigs hp 19 100 200000 # 20% dutycycle
 .br
 
 .br
-$ pigs hp 19 125000001 100000
+$ pigs hp 19 400000000 100000
 .br
 -96
 .br
-ERROR: hardware PWM frequency not 1-125M
+ERROR: invalid hardware PWM frequency
 .br
 
 .EE
@@ -1745,14 +1745,14 @@ The GPIO must be one of the following.
 
 .br
 The actual number of steps beween off and fully on is the
-integral part of 250 million divided by \fBpf\fP.
+integral part of 250M/\fBpf\fP (375M/\fBpf\fP for the BCM2711).
 
 .br
-The actual frequency set is 250 million / steps.
+The actual frequency set is 250M/steps (375M/steps for the BCM2711).
 
 .br
-There will only be a million steps for a \fBpf\fP of 250.
-Lower frequencies will have more steps and higher
+There will only be a million steps for a \fBpf\fP of 250 (375 for
+the BCM2711). Lower frequencies will have more steps and higher
 frequencies will have fewer steps.  \fBpdc\fP is
 automatically scaled to take this into account.
 
@@ -5125,7 +5125,7 @@ The command expects a SPI channel.
 
 .br
 
-.IP "\fBcf\fP - hardware clock frequency (4689-250M)" 0
+.IP "\fBcf\fP - hardware clock frequency (4689-250M, 13184-375M for the BCM2711)" 0
 The command expects a frequency.
 
 .br
@@ -5408,7 +5408,7 @@ The command expects a dutycycle.
 
 .br
 
-.IP "\fBpf\fP - hardware PWM frequency (1-125M)" 0
+.IP "\fBpf\fP - hardware PWM frequency (1-125M, 1-187.5M for the BCM2711)" 0
 The command expects a frequency.
 
 .br
diff --git a/setup.py b/setup.py
index a0cb293..2b5505c 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 from distutils.core import setup
 
 setup(name='pigpio',
-      version='1.43',
+      version='1.44',
       author='joan',
       author_email='joan@abyz.me.uk',
       maintainer='joan',