diff --git a/README.md b/README.md
index abbbd24..bc1580d 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,3 @@
 # python-gtk-helloworld
+
+run `sh ./install.sh` if doesn't run.
diff --git a/install.sh b/install.sh
index 46aece2..fa1478f 100644
--- a/install.sh
+++ b/install.sh
@@ -1,2 +1,3 @@
+# these should already be available on raspbian
 sudo apt-get install libgtk-3-dev
 sudo apt-get install python3-gi