diff --git a/mailnews/addrbook/resources/locale/en-US/abMainWindow.dtd b/mailnews/addrbook/resources/locale/en-US/abMainWindow.dtd
index 5c1a04a7600..32f9e636f2c 100644
--- a/mailnews/addrbook/resources/locale/en-US/abMainWindow.dtd
+++ b/mailnews/addrbook/resources/locale/en-US/abMainWindow.dtd
@@ -95,7 +95,7 @@ Rights Reserved.
 <!ENTITY newlistButton.tooltip                          "Create a new list"> 
 <!ENTITY editButton.tooltip                             "Edit the selected card"> 
 <!ENTITY newmsgButton.tooltip                           "Send a mail message"> 
-<!ENTITY newIM.tooltip                                  "Send an instant message"> 
+<!ENTITY newIM.tooltip                                  "Send an instant message or chat"> 
 <!ENTITY deleteButton.tooltip                           "Delete selected card or address book"> 
 <!ENTITY stopButton.tooltip                             "Stop the current transfer"> 
 <!ENTITY searchButton.tooltip                           "Search the selected address book">