diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index 76c62475b..6f388cf9e 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -23,6 +23,11 @@ For example on a computer with interfaces 10.5.1.1/24, 10.5.2.1/24, and 10.5.3.1
 setting "EPICS_CAS_INTF_ADDR_LIST='10.5.1.1 10.5.2.1'" will accept traffic
 on the .1.1 and .2.1, but ignore from .3.1</p>
 
+<p>Previously, CA servers (RSRV and PCAS) would build the beacon address list
+using EPICS_CA_ADDR_LIST if EPICS_CAS_BEACON_ADDR_LIST was no set.
+This is no longer done.
+Sites depending on this should set both envronment variables to the same value.</p>
+
 <h3>IPv4 multicast for name search and beacons</h3>
 
 <p>libca and RSRV may now use IPv4 multicasting for UDP traffic (name search and beacons).