diff --git a/plugins/test/a_module.py b/plugins/test/a_module.py
index 0d6cecac6a..1018d89ff1 100644
--- a/plugins/test/a_module.py
+++ b/plugins/test/a_module.py
@@ -13,6 +13,7 @@ DOCUMENTATION = '''
   description:
     - Test whether a given string refers to an existing module or action plugin.
     - This can be useful in roles, which can use this to ensure that required modules are present ahead of time.
+    - M(foo).
   options:
     _input:
       description: A string denoting a fully qualified collection name (FQCN) of a module or action plugin.