diff --git a/README.md b/README.md
index 4dfb010..2b16617 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,7 @@ xcb,xkb,libxkbcommon
 
 #####Ubuntu:
 ```yml
+sudo apt-get install gcc libc6-dev
 
 sudo apt-get install libx11-dev
 #sudo apt-get install libgtkglextmm-x11-dev
@@ -85,6 +86,8 @@ sudo apt-get install libxkbcommon-dev
 
 ```
 
+png.h: No such file or directory?Please see [issues/47](https://github.com/go-vgo/robotgo/issues/47).
+
 ##Installation:
 ```
 go get github.com/go-vgo/robotgo
diff --git a/README_zh.md b/README_zh.md
index c9e417d..c1bf307 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -66,6 +66,7 @@ xcb,xkb,libxkbcommon
 #####Ubuntu:
 
 ```yml
+sudo apt-get install gcc libc6-dev
 
 sudo apt-get install libx11-dev
 #sudo apt-get install libgtkglextmm-x11-dev
@@ -82,6 +83,8 @@ sudo apt-get install libxkbcommon-dev
 
 ```
 
+png.h: No such file or directory?Please see [issues/47](https://github.com/go-vgo/robotgo/issues/47).
+
 ##Installation:
 ```
 go get github.com/go-vgo/robotgo