diff --git a/docs/install.rst b/docs/install.rst
index 9c2ce27..fbca119 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -51,7 +51,8 @@ Update the package lists, and install the required system software::
 
   $ sudo apt-get update
   $ sudo apt-get install --yes virtualenvwrapper postgresql git \
-      python-pip rabbitmq-server libpq-dev python-dev ntp memcached
+      python-pip rabbitmq-server libpq-dev python-dev ntp memcached \
+      libmemcached-dev
 
 Set up *PostgreSQL* to listen on localhost and restart it::