diff --git a/lib/racc/parser.rb b/lib/racc/parser.rb
index 4237fb572c..078bfef3e9 100644
--- a/lib/racc/parser.rb
+++ b/lib/racc/parser.rb
@@ -20,7 +20,7 @@ module Racc
   class ParseError < StandardError; end
 end
 unless defined?(::ParseError)
-  ParseError = Racc::ParseError
+  ParseError = Racc::ParseError # :nodoc:
 end
 
 # Racc is a LALR(1) parser generator.