diff --git a/lib/racc/parser-text.rb b/lib/racc/parser-text.rb
index 4188fa853d..0579f4ce9b 100644
--- a/lib/racc/parser-text.rb
+++ b/lib/racc/parser-text.rb
@@ -22,7 +22,7 @@ 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.