diff --git a/.document b/.document
index b41b4d08b0..746ca2929d 100644
--- a/.document
+++ b/.document
@@ -15,4 +15,5 @@ lib
 
 ext
 
-doc/re.rb
+# rdoc files
+doc/*.rdoc
diff --git a/doc/re.rb b/doc/re.rdoc
similarity index 100%
rename from doc/re.rb
rename to doc/re.rdoc
diff --git a/lib/rdoc/parser/ruby.rb b/lib/rdoc/parser/ruby.rb
index cf6c1ad221..fde3964a60 100644
--- a/lib/rdoc/parser/ruby.rb
+++ b/lib/rdoc/parser/ruby.rb
@@ -1458,7 +1458,7 @@ end
 
 class RDoc::Parser::Ruby < RDoc::Parser
 
-  parse_files_matching(/\.rbw?$/)
+  parse_files_matching(/\.(?:rbw?|rdoc)\z/)
 
   include RDoc::RubyToken
   include RDoc::TokenStream