diff --git a/moduleroot/.github/CONTRIBUTING.md.erb b/moduleroot/.github/CONTRIBUTING.md.erb
index 7a0980a9..7cd7a447 100644
--- a/moduleroot/.github/CONTRIBUTING.md.erb
+++ b/moduleroot/.github/CONTRIBUTING.md.erb
@@ -40,9 +40,18 @@ you must set an environment variable such as:
 
     export PUPPET_VERSION="~> 4.2.0"
 
-Install the dependencies like so...
+You can install all needed gems for spec tests into the modules directory by
+running:
 
-    bundle install
+```sh
+bundle install --path .vendor/ --without development --without system_tests --without release; bundle update; bundle clean
+```
+
+If you also want to run acceptance tests:
+
+```sh
+bundle install --path .vendor/ --without development --with system_tests --without release;
+```
 
 ## Syntax and style