diff --git a/ChangeLog b/ChangeLog
index 6417f21663..fdac0ae480 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Apr  1 13:16:19 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* process.c (rb_f_sleep): RDoc disambiguation.  [ruby-talk:332632]
+
 Tue Mar 31 15:17:37 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in: fixed the help strings for the header and library
diff --git a/process.c b/process.c
index 4b39d897fe..f86ee199a6 100644
--- a/process.c
+++ b/process.c
@@ -3220,8 +3220,8 @@ rb_f_spawn(int argc, VALUE *argv)
  *  Suspends the current thread for _duration_ seconds (which may be any number,
  *  including a +Float+ with fractional seconds). Returns the actual number of
  *  seconds slept (rounded), which may be less than that asked for if another
- *  thread calls <code>Thread#run</code>. Zero arguments causes +sleep+ to sleep
- *  forever.
+ *  thread calls <code>Thread#run</code>. Called without an argument, sleep()
+ *  will sleep forever.
  *
  *     Time.new    #=> 2008-03-08 19:56:19 +0900
  *     sleep 1.2   #=> 1