diff --git a/res/values/strings.xml b/res/values/strings.xml
index 6eaa627e644..0797fe6e96f 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -4923,6 +4923,8 @@
     <string name="background_activity_warning_dialog_title">Limit background activity?</string>
     <!-- TODO: Pending UX review. Text for the warning dialog to show to the user when limiting background activity for an app -->
     <string name="background_activity_warning_dialog_text">If you limit background activity for an app, it may misbehave</string>
+    <!-- Dialog message when app can't been restricted because it is not optimized [CHAR_LIMIT=120] -->
+    <string name="background_activity_disabled_dialog_text">Since this app is not set to optimize battery, you can\u2019t restrict it.\n\nTo restrict the app, first turn on battery optimization.</string>
 
     <!-- Title for the screen usage in power use UI [CHAR_LIMIT=60] -->
     <string name="device_screen_usage">Screen usage since full charge</string>