diff --git a/gn_build.sh b/gn_build.sh
index 5b4060bcb2f869..a7aa28aea5cfbe 100755
--- a/gn_build.sh
+++ b/gn_build.sh
@@ -114,6 +114,8 @@ if [[ -d "${ANDROID_NDK_HOME}/toolchains" && -d "${ANDROID_HOME}/platforms" ]];
 else
     echo
     echo "Hint: Set \$ANDROID_HOME and \$ANDROID_NDK_HOME to enable building for Android"
+    echo "      The required android sdk platform version is 21. It can be obtained from"
+    echo "      https://dl.google.com/android/repository/android-21_r02.zip"
 fi
 
 echo