diff --git a/ChangeLog b/ChangeLog
index 66ef7ffa78..53d9340ea3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Dec 13 10:44:44 2015  Martin Duerst  <duerst@it.aoyama.ac.jp>
+
+	* KNOWNBUGS.rb: Fixed typo, made more explicit [ci skip]
+
 Sun Dec 13 10:26:47 2015  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/openssl/ossl_ssl.c (ssl_npn_select_cb_common): fix parsing
diff --git a/KNOWNBUGS.rb b/KNOWNBUGS.rb
index b97a08d928..35a8e75876 100644
--- a/KNOWNBUGS.rb
+++ b/KNOWNBUGS.rb
@@ -1,5 +1,7 @@
 #
-# This test file concludes tests which point out known bugs.
+# IMPORTANT: Always keep the first 7 lines (comments),
+# even if this file is otherwise empty.
+#
+# This test file includes tests which point out known bugs.
 # So all tests will cause failure.
 #
-