diff --git a/README.md b/README.md
index 6d1dbb94..a70d8926 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ State as of ###.
 ## Common commands
 Install packages
 ```
-sudo apt-get install rubygems
+sudo apt-get install rubygems ruby-dev
 sudo gem install bundler
 bundle install
 ```