diff --git a/Library/Homebrew/requirements/codesign_requirement.rb b/Library/Homebrew/requirements/codesign_requirement.rb
index b3643e6f23..dbec98dba9 100644
--- a/Library/Homebrew/requirements/codesign_requirement.rb
+++ b/Library/Homebrew/requirements/codesign_requirement.rb
@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# A requirement on a code-signing identity.
+#
+# @api private
 class CodesignRequirement < Requirement
   fatal true