diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index 5a8494439e6..dbff044e68c 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,3 +1,7 @@
+2009-06-24  Chong Yidong  <cyd@stupidchicken.com>
+
+	* display.texi (Window Systems): Add ns to the list.
+
 2009-06-21  Chong Yidong  <cyd@stupidchicken.com>
 
 	* Branch for 23.1.
diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 17563140436..78719d2e432 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -5837,6 +5837,9 @@ for displaying the frame.  The possible values are
 Emacs is displaying the frame using X.
 @item w32
 Emacs is displaying the frame using native MS-Windows GUI.
+@item ns
+Emacs is displaying the frame using the Nextstep interface (used on
+GNUstep and Mac OS X).
 @item pc
 Emacs is displaying the frame using MS-DOS direct screen writes.
 @item nil