diff --git a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
index f7c06f87669..d462b44919b 100644
--- a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
+++ b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
@@ -323,7 +323,10 @@ alarmTodayAt=Today at %1$S
 alarmTomorrowAt=Tomorrow at %1$S
 alarmYesterdayAt=Yesterday at %1$S
 
-# Alarm interface stringes
+# Alarm interface strings
+# LOCALIZATION NOTE: These strings do not get displayed. They are only visible
+# when exporting an item with i.e a DISPLAY alarm, that doesn't have a
+# description set, or an EMAIL alarm that doesn't have a summary set.
 alarmDefaultDescription=Default Mozilla Description
 alarmDefaultSummary=Default Mozilla Summary