diff --git a/README.md b/README.md
index da2df80..bb5d610 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,23 @@ Now I just copy the ss-local from home brew. Run ss-local executable as a Launch
 Serve pac js file as a file url. So there are only some souce codes related to GUI left. 
 Then I rewrite the gui code by swift.
 
+## Requirements
+
+### Running
+
+- Mac OS X 10.10 +
+
+### Building
+
+- XCode 7.3+
+- cocoapod 1.0+
+
 ## TODO List
 
 - GUI for OTA config
 - Copy a ss url to pasteboard in the server profile UI.
+
+## Known Inssues
+
+- ss-local depand on libcrypto.1.0.0.dylib need installed by home brew.
+