diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index 42079473d2..a5e3740184 100644
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -15,6 +15,9 @@ require "fcntl"
 require "socket"
 require "cmd/install"
 
+# A formula build.
+#
+# @api private
 class Build
   attr_reader :formula, :deps, :reqs, :args