diff --git a/docs/build.md b/docs/build.md
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+#Building the firmware
+There are essentially three ways to build your NodeMCU firmware: cloud build service, Docker image, dedicated Linux environment (possibly VM).
+
+##Cloud build serivce
+NodeMCU "application developers" just need a ready-made firmware. There's a [cloud build service](http://nodemcu-build.com/) with a nice UI and configuration options for them.
+
+##Docker image
+Occasional NodeMCU firmware hackers don't need full control over the complete tool chain. They might not want to setup a Linux VM with the build environment. Docker to the rescue. https://hub.docker.com/r/marcelstoer/nodemcu-build/
+
+##Linux build environment
+NodeMCU firmware developers commit or contribute to the project on GitHub and might want to build their own full fledged build environment with the complete tool chain. http://www.esp8266.com/wiki/doku.php?id=toolchain#how_to_setup_a_vm_to_host_your_toolchain
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diff --git a/docs/modules/node.md b/docs/modules/node.md
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+##node.restart()
+####Description
+restart the chip.
+
+####Syntax
+node.restart()
+
+####Parameters
+ - `nil`
+
+####Returns
+ - `nil`
+
+####Example
+   
+```lua
+    node.restart();
+```
+
+## node.dsleep()
+####Description
+Enter deep sleep mode, wake up when timed out.
+
+####Syntax
+`node.dsleep(us, option)`
+
+**Note:** This function can only be used in the condition that esp8266 PIN32(RST) and PIN8(XPD_DCDC aka GPIO16) are connected together. Using sleep(0) will set no wake up timer, connect a GPIO to pin RST, the chip will wake up by a falling-edge on pin RST.<br />
+option=0, init data byte 108 is valuable;<br />
+option>0, init data byte 108 is valueless.<br />
+More details as follows:<br />
+0, RF_CAL or not after deep-sleep wake up, depends on init data byte 108.<br />
+1, RF_CAL after deep-sleep wake up, there will belarge current.<br />
+2, no RF_CAL after deep-sleep wake up, there will only be small current.<br />
+4, disable RF after deep-sleep wake up, just like modem sleep, there will be the smallest current.
+
+####Parameters
+ - `us`: number(Integer) or nil, sleep time in micro second. If us = 0, it will sleep forever. If us = nil, will not set sleep time.
+
+ - `option`: number(Integer) or nil. If option = nil, it will use last alive setting as default option.
+
+####Returns
+- `nil`
+
+####Example
+
+```lua
+    --do nothing
+    node.dsleep()
+    --sleep μs
+    node.dsleep(1000000)
+    --set sleep option, then sleep μs
+    node.dsleep(1000000, 4)
+    --set sleep option only
+    node.dsleep(nil,4)
+```
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