diff --git a/calendar/resources/locale/en-US/calendar.dtd b/calendar/resources/locale/en-US/calendar.dtd
index c4e71736fef..f1fa5009f02 100644
--- a/calendar/resources/locale/en-US/calendar.dtd
+++ b/calendar/resources/locale/en-US/calendar.dtd
@@ -317,7 +317,7 @@
 <!ENTITY calendar.about.title "About Mozilla Calendar">
 <!ENTITY calendar.about.tab   "About">
 
-<!ENTITY throbber.tooltip "Home page">
+<!ENTITY throbber.tooltip "Go to the Mozilla home page">
 <!ENTITY menuBar.tooltip "Menu bar">
 <!ENTITY navigationToolbar.tooltip "Navigation Toolbar">