diff --git a/calendar/base/public/calICalendar.idl b/calendar/base/public/calICalendar.idl
index bfae91834322..1bde379ec1b6 100644
--- a/calendar/base/public/calICalendar.idl
+++ b/calendar/base/public/calICalendar.idl
@@ -58,6 +58,7 @@ interface calICalendar : nsISupports
 {
   /**
    * Name of the calendar
+   * Notes: Can only be set after the calendar is registered with the calendar manager.
    */
   attribute AUTF8String name;