diff --git a/client/tests/stubs.js b/client/tests/stubs.js
index ca49d1d2e1..d852fd801c 100644
--- a/client/tests/stubs.js
+++ b/client/tests/stubs.js
@@ -58,6 +58,7 @@ global.wagtailConfig = {
     DELETE_ERROR: 'Delete error',
     CONFIRM_DELETE_COMMENT: 'Are you sure?',
     SAVE_ERROR: 'Save error',
+    SAVE_COMMENT_WARNING: 'This will be saved when the page is saved',
     FOCUS_COMMENT: 'Focus comment',
     UNFOCUS_COMMENT: 'Unfocus comment'
   },
diff --git a/wagtail/admin/localization.py b/wagtail/admin/localization.py
index e74b139ca0..daada2168a 100644
--- a/wagtail/admin/localization.py
+++ b/wagtail/admin/localization.py
@@ -90,6 +90,7 @@ def get_js_translation_strings():
         'DELETE_ERROR': _('Delete error'),
         'CONFIRM_DELETE_COMMENT': _('Are you sure?'),
         'SAVE_ERROR': _('Save error'),
+        'SAVE_COMMENT_WARNING': _('This will be saved when the page is saved'),
         'FOCUS_COMMENT': _('Focus comment'),
         'UNFOCUS_COMMENT': _('Unfocus comment'),