diff --git a/README.md b/README.md
index c98004e..27ceaf5 100644
--- a/README.md
+++ b/README.md
@@ -44,8 +44,10 @@ Based on http://openjdk.java.net/projects/mobile/android.html
 
 ### Run in this directory:
 ```
-export JDK_DEBUG_LEVEL=[release/fastdebug/debug]
+# If want change, set it
 export NDK_VERSION=r14
+
+export JDK_DEBUG_LEVEL=[release/fastdebug/debug]
 ./extractndk.sh
 ./getlibs.sh
 ./maketoolchain.sh
diff --git a/setdevkitpath.sh b/setdevkitpath.sh
index a6a37fe..eb0b303 100644
--- a/setdevkitpath.sh
+++ b/setdevkitpath.sh
@@ -1,4 +1,7 @@
-export NDK_VERSION=r14
+if [ -z "$NDK_VERSION" ]
+then
+  export NDK_VERSION=r18
+fi
 
 if [ -z "$JDK_DEBUG_LEVEL" ]
 then