diff --git a/skeleton/CONTRIBUTING.md b/skeleton/CONTRIBUTING.md
index 36d07a8..4ed29a4 100644
--- a/skeleton/CONTRIBUTING.md
+++ b/skeleton/CONTRIBUTING.md
@@ -30,7 +30,7 @@ By default the tests use a baseline version of Puppet.
 If you have Ruby 2.x or want a specific version of Puppet,
 you must set an environment variable such as:
 
-    export PUPPET_VERSION="~> 3.2.0"
+    export PUPPET_GEM_VERSION="~> 3.2.0"
 
 Install the dependencies like so...