diff --git a/README.md b/README.md
index e34c91a..811f2ec 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ LayaNative is a complete set of development solutions for the development, testi
 
 - Android
 
-1. On Mac or Linux, Install android studio and configure the Android SDK related environment variables 
+1. On Mac or Linux, Install android studio and configure the Android SDK（android-ndk-r21d） related environment variables 
 2. cd Conch/build and then run ./buildAll-andoid.sh
 3. Open Conch/build/conc/proj.android_studio with android_studio
 4. Build and then run proj.android_studio