diff --git a/UPGRADE.txt b/UPGRADE.txt
index fd4af6b4ab..a771b6e337 100644
--- a/UPGRADE.txt
+++ b/UPGRADE.txt
@@ -25,6 +25,14 @@ from 1.8.27.0 to 1.8.28.0:
   hide the "1 missed call" if one of the other dialed accounts picks up the
   call.
 
+* Added a new Compiler Flag, REF_DEBUG. When enabled, reference counted
+  objects will emit additional debug information to the refs log file located
+  in the standard Asterisk log file directory. This log file is useful in
+  tracking down object leaks and other reference counting issues. Prior to
+  this version, this option was only available by modifying the source code
+  directly. This change also includes a new script, refcounter.py, in the
+  contrib folder that will process the refs log file.
+
 from 1.8.26.0 to 1.8.27.0:
 * res_fax now returns the correct rates for V.27ter (4800 or 9600 bit/s).
   Because of this the default settings would not load, so the minrate (minimum