diff --git a/UPGRADE.txt b/UPGRADE.txt
index b53cae6553..e748359609 100644
--- a/UPGRADE.txt
+++ b/UPGRADE.txt
@@ -40,8 +40,10 @@ Functions:
   modules.conf file then you will need to explicitly load the modules that
   contain the functions you want to use.
 
-* The ENUM() function no longer supplies a default zone for searching; instead,
-  it uses the default zone(s) defined in enum.conf.
+* The ENUMLOOP() function no longer supplies a default zone for searching; instead,
+  it uses the default zone(s) defined in enum.conf. In addition, when the 'c'
+  option (for counting the number of records is specified), but the lookup fails
+  to match any records, the returned value will now be "0" instead of blank.
 
 The SIP channel: