diff --git a/docs/sources/installation/ubuntulinux.md b/docs/sources/installation/ubuntulinux.md
index fc2330f8ca..efeeeea2e1 100644
--- a/docs/sources/installation/ubuntulinux.md
+++ b/docs/sources/installation/ubuntulinux.md
@@ -31,6 +31,7 @@ To install the latest Ubuntu package (may not be the latest Docker release):
     $ sudo apt-get install docker.io
     $ sudo ln -sf /usr/bin/docker.io /usr/local/bin/docker
     $ sudo sed -i '$acomplete -F _docker docker' /etc/bash_completion.d/docker.io
+    $ source /etc/bash_completion.d/docker.io
 
 If you'd like to try the latest version of Docker: