diff --git a/README.md b/README.md
index 1a9498e35c5c320ffe878a6b6919ace4ec373fd9..4d23aa005bbaed2c2b442358cd92beb93c6d1726 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,7 @@ simplest way to setup and start the server, but it requires a few
 additional Python modules:
  * daemon
  * pyyaml
+ * pexpect
 
 Once all prerequisites are installed, try: