diff --git a/ChangeLog b/ChangeLog
index 881c9f7c7d..0881fc7865 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Dec 25 18:30:34 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* thread.c (rb_thread_atfork): Add small comment why we need
+	  reset random seed.
+
 Sat Dec 25 17:33:55 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/csv/base.rb (TestCSV.with_diffrent_ofs): give name to
diff --git a/thread.c b/thread.c
index dbe837fcce..9173833f2f 100644
--- a/thread.c
+++ b/thread.c
@@ -2800,6 +2800,8 @@ rb_thread_atfork(void)
 {
     rb_thread_atfork_internal(terminate_atfork_i);
     GET_THREAD()->join_list_head = 0;
+
+    /* We don't want reproduce CVE-2003-0900. */
     rb_reset_random_seed();
 }