diff --git a/Library/Homebrew/searchable.rb b/Library/Homebrew/searchable.rb
index 43fa35241d..9b9adc7606 100644
--- a/Library/Homebrew/searchable.rb
+++ b/Library/Homebrew/searchable.rb
@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# Helper module for making a class searchable with both regular expressions and strings.
+#
+# @api private
 module Searchable
   def search(string_or_regex, &block)
     case string_or_regex