diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index ffe8ee4d1..fd9e42035 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -118,8 +118,8 @@ Notes
 * Network configuration is pretty sensitive, better not to touch it
   without deep understanding.
 
-* This configuration disables **heat**, **cinder** and **tempest**, adjust it
-  if you need these services.
+* This configuration disables **horizon**, **heat**, **cinder** and
+  **tempest**, adjust it if you need these services.
 
 Start the install::