diff --git a/hack/tfw.sh b/hack/tfw.sh
index d079650..8cb7338 100755
--- a/hack/tfw.sh
+++ b/hack/tfw.sh
@@ -81,5 +81,9 @@ case $1 in
     ;;
     *)
         echo "Usage: tfw.sh [buildtfw|build|start|buildstart]"
+        echo "          |--- buildtfw: build TFW baseimage"
+        echo "          |--- build: build TFW test"
+        echo "          |--- start: start TFW test"
+        echo "          |--- buildstart: build all, then start TFW test"
     ;;
 esac