diff --git a/Library/Homebrew/requirements/tuntap_requirement.rb b/Library/Homebrew/requirements/tuntap_requirement.rb
index 80b842977d..6f9cec4cfd 100644
--- a/Library/Homebrew/requirements/tuntap_requirement.rb
+++ b/Library/Homebrew/requirements/tuntap_requirement.rb
@@ -2,6 +2,9 @@
 
 require "requirement"
 
+# A requirement on TunTap for macOS.
+#
+# @api private
 class TuntapRequirement < Requirement
   fatal true
   cask "tuntap"