diff --git a/Library/Homebrew/commands.rb b/Library/Homebrew/commands.rb
index fe279bb777..30098ae92b 100644
--- a/Library/Homebrew/commands.rb
+++ b/Library/Homebrew/commands.rb
@@ -2,6 +2,9 @@
 
 require "cask/cmd"
 
+# Helper functions for commands.
+#
+# @api private
 module Commands
   module_function