diff --git a/ChangeLog b/ChangeLog
index 0a3ac7f273..89eda3ebb4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Nov 11 09:38:55 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* lib/rdoc/known_classes.rb: reverted regression changes of
+	  rdoc known class.
+
 Tue Nov 11 00:21:50 2014  Tanaka Akira  <akr@fsij.org>
 
 	* test/net/imap/test_imap.rb: Don't ignore exceptions on server
diff --git a/lib/rdoc/known_classes.rb b/lib/rdoc/known_classes.rb
index ddc932c7c0..a04068a435 100644
--- a/lib/rdoc/known_classes.rb
+++ b/lib/rdoc/known_classes.rb
@@ -59,7 +59,6 @@ module RDoc
     "rb_eZeroDivError"     => "ZeroDivError",
 
     "rb_mComparable"       => "Comparable",
-    "rb_mDL"               => "DL",
     "rb_mEnumerable"       => "Enumerable",
     "rb_mErrno"            => "Errno",
     "rb_mFConst"           => "File::Constants",