diff --git a/docs/en/modules/uart.md b/docs/en/modules/uart.md
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+# uart Module
+The uart module allows configuration of and communication over the uart serial port.
+
+## uart.setup()
+
+(Re-)configures the communication parameters of the UART.
+
+####Syntax
+`uart.setup(id, baud, databits, parity, stopbits, echo)`
+
+####Parameters
+  - `id`: Always zero, only one uart supported.
+  - `baud`: One of 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 74880, 115200, 230400, 460800, 921600, 1843200, 2686400.
+  - `databits`: One of 5, 6, 7, 8.
+  - `parity`: uart.PARITY_NONE, uart.PARITY_ODD, or uart.PARITY_EVEN.
+  - `stopbits`: uart.STOPBITS_1, uart.STOPBITS_1_5, or uart.STOPBITS_2.
+  - `echo`: if zero, disable echo, otherwise enable echo.
+
+####Returns
+number:configured baud rate
+
+####Example
+```lua
+-- configure for 9600, 8N1, with echo
+uart.setup(0, 9600, 8, uart.PARITY_NONE, uart.STOPBITS_1, 1)
+```
+___
+## uart.write()
+
+Write string or byte to the uart.
+
+####Syntax
+uart.write(id, data1 [, data2, ...])
+
+####Parameters
+  - `id`: Always zero, only one uart supported.
+  - `data1`...: String or byte to send via uart.
+
+####Returns
+`nil`
+
+####Example
+```lua
+uart.write(0, "Hello, world\n")
+```
+___
+## uart.on()
+
+Sets the callback function to handle uart events.
+
+Currently only the "data" event is supported.
+
+####Syntax
+`uart.on(method, [number/end_char], [function], [run_input])`
+
+####Parameters
+  - `method`: "data", data has been received on the uart
+  - `number/end_char`:
+    - if pass in a number n<255, the callback will called when n chars are received.
+    - if n=0, will receive every char in buffer.
+    - if pass in a one char string "c", the callback will called when "c" is encounterd, or max n=255 received.
+  - `function`: callback function, event "data" has a callback like this: function(data) end
+  - `run_input`: 0 or 1; If 0, input from uart will not go into Lua interpreter, can accept binary data. If 1, input from uart will go into Lua interpreter, and run.
+
+To unregister the callback, provide only the "data" parameter.
+
+####Returns
+`nil`
+
+####Example
+```lua
+-- when 4 chars is received.
+uart.on("data", 4,
+  function(data)
+	print("receive from uart:", data)
+	if data=="quit" then
+	  uart.on("data") -- unregister callback function
+	end
+end, 0)
+-- when '\r' is received.
+uart.on("data", "\r",
+  function(data)
+	print("receive from uart:", data)
+	if data=="quit\r" then
+	  uart.on("data") -- unregister callback function
+	end
+end, 0)
+```
+___
+
diff --git a/mkdocs.yml b/mkdocs.yml
index 80b24463..5cc23e0b 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -37,5 +37,6 @@ pages:
         - 'rtctime': 'en/modules/rtctime.md'
         - 'rtcfifo': 'en/modules/rtcfifo.md'
         - 'sntp': 'en/modules/sntp.md'
+        - 'uart': 'en/modules/uart.md'
 - Deutsch:
     - Home: 'de/index.md'