diff --git a/ChangeLog b/ChangeLog
index f5b71a2760..e1e8a68fb6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jun 18 23:45:11 2015  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
+
+	* safe.c: removed needless doc related $SAFE=2
+
 Thu Jun 18 23:38:07 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* thread.c (rb_thread_safe_level): fix document.  $SAFE=3 is obsolete.
diff --git a/safe.c b/safe.c
index c1eca672a0..7aae978272 100644
--- a/safe.c
+++ b/safe.c
@@ -12,7 +12,6 @@
 /* safe-level:
    0 - strings from streams/environment/ARGV are tainted (default)
    1 - no dangerous operation by tainted value
-   2 - process/file operations prohibited
 */
 
 #define SAFE_LEVEL_MAX RUBY_SAFE_LEVEL_MAX