diff --git a/ChangeLog b/ChangeLog
index 1a05cc21d2..9cd70f7cf8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Apr 29 12:33:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/thwait.rb (ThreadsWait#join): refined rdoc.  [ruby-core:29863]
+
 Thu Apr 29 12:16:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert): reject
diff --git a/lib/thwait.rb b/lib/thwait.rb
index e13ae074d5..7ac033d30d 100644
--- a/lib/thwait.rb
+++ b/lib/thwait.rb
@@ -74,7 +74,8 @@ class ThreadsWait
   end
 
   #
-  # Waits for specified threads to terminate.
+  # Waits for specified threads to terminate, and returns when any
+  # thread terminated.
   #
   def join(*threads)
     join_nowait(*threads)