diff --git a/Library/Homebrew/descriptions.rb b/Library/Homebrew/descriptions.rb
index 46b7f2ef31..6ba21bed47 100644
--- a/Library/Homebrew/descriptions.rb
+++ b/Library/Homebrew/descriptions.rb
@@ -5,6 +5,9 @@ require "formula_versions"
 require "search"
 require "searchable"
 
+# Helper class for printing and searching descriptions.
+#
+# @api private
 class Descriptions
   extend Homebrew::Search