diff --git a/calendar/locales/en-US/chrome/calendar/calendar.properties b/calendar/locales/en-US/chrome/calendar/calendar.properties
index 1a326ce4bc6c..f845952844e3 100644
--- a/calendar/locales/en-US/chrome/calendar/calendar.properties
+++ b/calendar/locales/en-US/chrome/calendar/calendar.properties
@@ -143,3 +143,9 @@ filterHtml=HTML Files
 filterCsv=Comma Separated
 filterOutlookCsv=Outlook Comma Separated
 filterRdf=iCalendar RDF
+
+# Remote calendar errors
+errorTitle=Error getting calendar
+httpError=Getting the calendar file failed.\nStatus code: %1$S: %2$S
+otherError=Getting the calendar file failed.\nStatus code: 0x%1$S
+contentError=This doesn't appear to be a valid file. Here's what I got back from\n%1$S:\nResult: %2$S