diff --git a/docs/howto_build_SDK.txt b/docs/howto_build_SDK.txt
index bb42fed75..e09440bf2 100644
--- a/docs/howto_build_SDK.txt
+++ b/docs/howto_build_SDK.txt
@@ -81,6 +81,7 @@ Then once you have all the source, simply build the SDK using:
 
   $ cd ~/my-android-git
   $ . build/envsetup.sh
+  $ lunch sdk-eng
   $ make sdk
 
 This will take a while, maybe between 20 minutes and several hours depending on