diff --git a/README.rst b/README.rst
index aadc8f2..5981588 100644
--- a/README.rst
+++ b/README.rst
@@ -85,7 +85,7 @@ Tips and Tricks
 
  Warning: You only want to do this inside a virtualenv. If you're using Linux, use your package manager to install Python packages globally whenever possible. Think twice before upgrading all packages system-wide on OSX.
 
-     $ pip install -U `yolk -U | awk '{print $1}'`
+     $ pip install -U `yolk -U | awk '{print $1}' | uniq`