diff --git a/README.md b/README.md
index 09dfc51..673cc2f 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ Getting Mosh
 
   * [Ubuntu][], through a PPA
 
+        sudo apt-get install python-software-properties
         sudo add-apt-repository ppa:keithw/mosh
         sudo apt-get update
         sudo apt-get install mosh