diff --git a/tests/build-kitkat.sh b/tests/build-kitkat.sh
index 93aecbc..87a2a3f 100755
--- a/tests/build-kitkat.sh
+++ b/tests/build-kitkat.sh
@@ -2,6 +2,10 @@
 #
 # Test script file that maps itself into a docker container and runs
 #
+# Example invocation:
+#
+# $ AOSP_VOL=$PWD/build ./build-kitkat.sh
+#
 set -ex
 
 if [ "$1" = "docker" ]; then