diff --git a/src/_locales/de/messages.json b/src/_locales/de/messages.json
index 051821b..8d126fc 100644
--- a/src/_locales/de/messages.json
+++ b/src/_locales/de/messages.json
@@ -83,6 +83,10 @@
     "message": "24-Stunden-Zeit",
     "description": "The name of the option that specifies if 24-hour time is in effect. If off, this means am/pm time."
   },
+  "announcement_24h_time": {
+    "message": "24-Stunden-Zeit ist jetzt verfügbar! Stellen Sie sich jetzt.",
+    "description": "An announcement message shown when the user first upgrades to a version that allows choosing 24-hour time."
+  },
   "option_show_time_until_next_event": {
     "message": "Zeigen Sie die verbleibende Zeit bis zur nächsten Veranstaltung.",
     "description": "The name of the option that tells the user that the extension will display the time on the badge."
diff --git a/src/_locales/en/messages.json b/src/_locales/en/messages.json
index 92681d7..3cb586a 100644
--- a/src/_locales/en/messages.json
+++ b/src/_locales/en/messages.json
@@ -104,6 +104,11 @@
     "description": "The name of the option that specifies if 24-hour time is in effect. If off, this means am/pm time."
   },
 
+  "announcement_24h_time": {
+    "message": "24-hr time is now available! Set now.",
+    "description": "An announcement message shown when the user first upgrades to a version that allows choosing 24-hour time."
+  },
+
   "option_show_time_until_next_event": {
     "message": "Show time remaining until the next event.",
     "description": "The name of the option that tells the user that the extension will display the time on the badge."
diff --git a/src/_locales/es/messages.json b/src/_locales/es/messages.json
index 75e314a..d8c73af 100644
--- a/src/_locales/es/messages.json
+++ b/src/_locales/es/messages.json
@@ -83,6 +83,10 @@
     "message": "Tiempo de 24 horas",
     "description": "The name of the option that specifies if 24-hour time is in effect. If off, this means am/pm time."
   },
+  "announcement_24h_time": {
+    "message": "Tiempo de 24 horas ya está disponible! Establezca ahora.",
+    "description": "An announcement message shown when the user first upgrades to a version that allows choosing 24-hour time."
+  },
   "option_show_time_until_next_event": {
     "message": "Mostrar el tiempo restante hasta el próximo evento.",
     "description": "The name of the option that tells the user that the extension will display the time on the badge."
diff --git a/src/manifest.json b/src/manifest.json
index abed143..d98563f 100644
--- a/src/manifest.json
+++ b/src/manifest.json
@@ -2,7 +2,7 @@
   "manifest_version": 2,
   "name": "__MSG_google_calendar_extension_name__",
   "description": "__MSG_google_calendar_extension_desc__",
-  "version": "1.4.1.0",
+  "version": "1.4.2.0",
   "default_locale": "en",
 
   "icons": {
diff --git a/src/versioning.js b/src/versioning.js
index 3dc7b1f..39f635a 100644
--- a/src/versioning.js
+++ b/src/versioning.js
@@ -45,8 +45,8 @@ versioning.checkVersion = function() {
  * @private
  */
 versioning.onVersionUpdated_ = function(fromVersion, toVersion) {
-  if (toVersion == '1.4.0.2') {
-    versioning.showAnnouncement_('...');
+  if (toVersion == '1.4.2.0') {
+    versioning.showAnnouncement_(chrome.i18n.getMessage('announcement_24h_time'));
   }
 };