diff --git a/README.md b/README.md
index 94c3dea..195dc53 100644
--- a/README.md
+++ b/README.md
@@ -9,16 +9,18 @@ Docker image to automate Ansible deployment tests with Molecule. The image was b
 ## Environment variables
 
 ```Shell
+# Target directory to clone custom modules
 MOLECULE_LIBRARY_DIR=$(pwd)/library
 
 # If you use custom modules you can specify a git repo containing these files.
 # The repo will be cloned so ansible can use it.
 MOLECULE_CUSTOM_MODULES_REPO=
 
-
+# Target base directory to clone plugins
 MOLECULE_PLUGINS_DIR=$(pwd)/plugins
 
 # If you have custom filters you can specify a git repo containing these files.
+# Will be cloned to $MOLECULE_PLUGINS_DIR/filter
 MOLECULE_CUSTOM_FILTERS_REPO=
 ```