diff --git a/E2/Readme.md b/E2/Readme.md
index 84bc85c..b5685d5 100644
--- a/E2/Readme.md
+++ b/E2/Readme.md
@@ -1,10 +1,12 @@
 ## General resource
 - [Basic information](intro.md)
-- [HTTP Protocol](http.md)
-- [Serial Port Protocol](uart)
-- [LANC Protocol](lanc.md)
 - [STP file](design/e2_3d.zip)
 
+## Control protocol
+- [HTTP Protocol](protocol/http.md)
+- [Serial Port Protocol](protocol/uart)
+- [LANC Protocol](protocol/lanc.md)
+
 ## Camera spec
 - [E2](spec/E2_spec.md)
 - [E2-S6](spec/S6_spec.md)
diff --git a/E2/intro.md b/E2/intro.md
index 84ae409..46b62a7 100644
--- a/E2/intro.md
+++ b/E2/intro.md
@@ -115,7 +115,7 @@ Based on a fully charged NP-F970.
 
 ## Control the camera
 ### HTTP based control
-see [HTTP Protocol](http.md)
+see [HTTP Protocol](protocol/http.md)
 #### Ethernet
 The Ethernet work in these 3 modes:
 
@@ -144,12 +144,14 @@ The WiFi in E2 work as a Access Point, connect your computer/smart phone to E2 t
 ### LANC
 It's compatible with [SONY's LANC](http://www.boehmel.de/lanc.htm).
 
+We add some extend commands to make it easier to control E2, see [extend command](protocol/lanc.md).
+
 ### Serial port
 In E2 series, we provide two types of serial port:
 - Virtual serial, USB CDC ACM
 - Real serial, TTL & RS232 level are supported in standard E2, TTL on E2 flagship.
 
-Check the [sample code](uart/example) for reference.
+Check the [sample code](protocol/uart/example) for reference.
 
 ## Overlay
 ### Exposure
diff --git a/E2/http.md b/E2/protocol/http.md
similarity index 100%
rename from E2/http.md
rename to E2/protocol/http.md
diff --git a/E2/lanc.md b/E2/protocol/lanc.md
similarity index 100%
rename from E2/lanc.md
rename to E2/protocol/lanc.md
diff --git a/E2/uart/example/.gitignore b/E2/protocol/uart/example/.gitignore
similarity index 100%
rename from E2/uart/example/.gitignore
rename to E2/protocol/uart/example/.gitignore
diff --git a/E2/uart/example/UartTool.pro b/E2/protocol/uart/example/UartTool.pro
similarity index 100%
rename from E2/uart/example/UartTool.pro
rename to E2/protocol/uart/example/UartTool.pro
diff --git a/E2/uart/example/camera.cpp b/E2/protocol/uart/example/camera.cpp
similarity index 100%
rename from E2/uart/example/camera.cpp
rename to E2/protocol/uart/example/camera.cpp
diff --git a/E2/uart/example/camera.h b/E2/protocol/uart/example/camera.h
similarity index 100%
rename from E2/uart/example/camera.h
rename to E2/protocol/uart/example/camera.h
diff --git a/E2/uart/example/cameraconfig.cpp b/E2/protocol/uart/example/cameraconfig.cpp
similarity index 100%
rename from E2/uart/example/cameraconfig.cpp
rename to E2/protocol/uart/example/cameraconfig.cpp
diff --git a/E2/uart/example/cameraconfig.h b/E2/protocol/uart/example/cameraconfig.h
similarity index 100%
rename from E2/uart/example/cameraconfig.h
rename to E2/protocol/uart/example/cameraconfig.h
diff --git a/E2/uart/example/crc16.cpp b/E2/protocol/uart/example/crc16.cpp
similarity index 100%
rename from E2/uart/example/crc16.cpp
rename to E2/protocol/uart/example/crc16.cpp
diff --git a/E2/uart/example/crc16.h b/E2/protocol/uart/example/crc16.h
similarity index 100%
rename from E2/uart/example/crc16.h
rename to E2/protocol/uart/example/crc16.h
diff --git a/E2/uart/example/imvt_cam_def.h b/E2/protocol/uart/example/imvt_cam_def.h
similarity index 100%
rename from E2/uart/example/imvt_cam_def.h
rename to E2/protocol/uart/example/imvt_cam_def.h
diff --git a/E2/uart/example/main.cpp b/E2/protocol/uart/example/main.cpp
similarity index 100%
rename from E2/uart/example/main.cpp
rename to E2/protocol/uart/example/main.cpp
diff --git a/E2/uart/example/mainwindow.cpp b/E2/protocol/uart/example/mainwindow.cpp
similarity index 100%
rename from E2/uart/example/mainwindow.cpp
rename to E2/protocol/uart/example/mainwindow.cpp
diff --git a/E2/uart/example/mainwindow.h b/E2/protocol/uart/example/mainwindow.h
similarity index 100%
rename from E2/uart/example/mainwindow.h
rename to E2/protocol/uart/example/mainwindow.h
diff --git a/E2/uart/example/msgcodec.cpp b/E2/protocol/uart/example/msgcodec.cpp
similarity index 100%
rename from E2/uart/example/msgcodec.cpp
rename to E2/protocol/uart/example/msgcodec.cpp
diff --git a/E2/uart/example/msgcodec.h b/E2/protocol/uart/example/msgcodec.h
similarity index 100%
rename from E2/uart/example/msgcodec.h
rename to E2/protocol/uart/example/msgcodec.h
diff --git a/E2/uart/example/uart_def.h b/E2/protocol/uart/example/uart_def.h
similarity index 100%
rename from E2/uart/example/uart_def.h
rename to E2/protocol/uart/example/uart_def.h