diff --git a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
index bc45d0115a3..23f55f3782f 100644
--- a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
+++ b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
@@ -145,6 +145,12 @@ TooManyAlarmsMessage=You have %1$S total alarms. We've shown you the last 6. Cli
 ## @loc none
 1001=Warning UID not found! Assigning new one.
 
+# Editing repeating items strings
+editRecurTitle=Editing a repeating item
+editRecurMessage=The item you are editing is a repeating item.  Do you want to edit all occurrences of it or only this single instance?
+editRecurAll=All occurrences
+editRecurSingle=This occurrence only
+
 # List of events or todos (unifinder)
 eventUntitled=Untitled