diff --git a/etc/NEWS b/etc/NEWS
index 484dfe855b9..62cd3e758ef 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -474,9 +474,10 @@ button labeled "diff".  Pushing it displays a Diff Mode buffer comparing
 the actual and expected output.
 
 +++
-** The variable 'math-tzone-names' is now now marked obsolete.
-Strings should use numeric abbreviations like "-0600" instead of
-alphabetic abbreviations like "CST", which are too often ambiguous.
+** The variables 'math-tzone-names' and 'timezone-world-timezones' are
+now marked obsolete.  Strings should use numeric abbreviations like
+"-0600" instead of alphabetic abbreviations like "CST", which are too
+often ambiguous.
 
 
 * Changes in Emacs 32.1 on Non-Free Operating Systems
diff --git a/lisp/timezone.el b/lisp/timezone.el
index 643e974ece0..ef8cbf253fc 100644
--- a/lisp/timezone.el
+++ b/lisp/timezone.el
@@ -51,9 +51,12 @@
     ("GMT-7"  .  -700) ("GMT-8"  .  -800) ("GMT-9"  .  -900)
     ("GMT-10" . -1000) ("GMT-11" . -1100) ("GMT-12" . -1200))
   "Time differentials of timezone from GMT in +-HHMM form.
-This list is obsolescent, and is present only for backwards compatibility,
+This list is obsolete, and is present only for backwards compatibility,
 because time zone names are ambiguous in practice; for example, abbreviations
-like \"PST\" can change meaning with time.  Use `current-time-zone' instead.")
+like \"PST\" can change meaning with time.")
+(make-obsolete-variable
+ 'timezone-world-timezones
+ "use numeric time zone abbreviations or `current-time-zone' instead." "32.1")
 
 (defvar timezone-months-assoc
   '(("JAN" .  1)("FEB" .  2)("MAR" .  3)