diff --git a/Shorewall2/releasenotes.txt b/Shorewall2/releasenotes.txt
index f40c1ccf3..c122e12df 100755
--- a/Shorewall2/releasenotes.txt
+++ b/Shorewall2/releasenotes.txt
@@ -554,7 +554,9 @@ New Features:
 22) You may now cause Shorewall to use the '--set-mss' option of the
     TCPMSS target. In other words, you can cause Shorewall to set the
     MSS field of SYN packets passing through the firewall to the value
-    you specify.
+    you specify. This feature extends the existing CLAMPMSS option in
+    /etc/shorewall/shorewall.conf by allowing that option to have a
+    numeric value as well as the values "Yes" and "No".
 
     Example: