diff --git a/gramps/gen/utils/grampslocale.py b/gramps/gen/utils/grampslocale.py
index 3f378ebb4..8caff25ed 100644
--- a/gramps/gen/utils/grampslocale.py
+++ b/gramps/gen/utils/grampslocale.py
@@ -65,6 +65,7 @@ if HAVE_ICU:
 # when a new translation is added.  Note the dummy _(): That's just to
 # get xgettext to include the string in gramps.pot; actual translation
 # is done in _get_language_string() below.
+# (The gramps officially-supported language list is ALL_LINGUAS in setup.py)
 _ = lambda x: x
 _LOCALE_NAMES = {
     'ar': ('Arabic_Saudi Arabia', '1256', _("Arabic")),
@@ -105,7 +106,8 @@ _LOCALE_NAMES = {
     'tr': ('Turkish_Turkey', '1254', _("Turkish")),
     'uk': ('Ukrainian_Ukraine', '1251', _("Ukrainian")),
     'vi': ('Vietnamese_Viet Nam', '1258', _("Vietnamese")),
-    'zh_CN': ('Chinese_China', '936', _("Chinese Simplified")),
+    'zh_CN': ('Chinese_China', '936', _("Chinese (Simplified)")),
+    'zh_TW': ('Chinese_Taiwan', '950', _("Chinese (Traditional)")),
     }
 
 def _check_mswin_locale(locale):
diff --git a/setup.py b/setup.py
index b756c94d3..4cdeb8680 100644
--- a/setup.py
+++ b/setup.py
@@ -49,6 +49,8 @@ import io
 from gramps.version import VERSION
 import unittest
 
+# this list MUST be a subset of _LOCALE_NAMES in gen/utils/grampslocale.py
+# (that is, if you add a new language here, be sure it's in _LOCALE_NAMES too)
 ALL_LINGUAS = ('ar', 'bg', 'ca', 'cs', 'da', 'de', 'el', 'en_GB', 'es',
                'fi', 'fr', 'he', 'hr', 'hu', 'it', 'ja', 'lt', 'nb', 'nl',
                'nn', 'pl', 'pt_BR', 'pt_PT', 'ru', 'sk', 'sl', 'sq', 'sv',