diff --git a/INSTALL b/INSTALL
index 3be3bd694..4f5881afe 100644
--- a/INSTALL
+++ b/INSTALL
@@ -2,6 +2,8 @@
 
 ## Installing Plinth
 
+Install the python-cheetah package.
+
 Unzip and untar the source into a directory.  Change to the directory
 containing the program.  Run `./plinth.py` and point your web
 browser at `localhost:8000`.  The default username is "admin" and the