diff --git a/docs/getting-started-guides/ubuntu/installation.md b/docs/getting-started-guides/ubuntu/installation.md
index b8f892dc46..cc93995144 100644
--- a/docs/getting-started-guides/ubuntu/installation.md
+++ b/docs/getting-started-guides/ubuntu/installation.md
@@ -38,7 +38,8 @@ so we can find them.
   - OpenStack deployments are currently only tested on Icehouse and newer.
 - Network access to the following domains
   - *.jujucharms.com
-  - gcr.io 
+  - gcr.io
+  - github.com
   - Access to an Ubuntu mirror (public or private)