diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index 606fc65c1..2561f2cf4 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -21,6 +21,18 @@
 
 -->
 
+<h3>EPICS_CA_MAX_ARRAY_BYTES is optional</h3>
+
+<p>
+With this change libca, RSRV, and PCAS no longer need to use EPICS_CA_MAX_ARRAY_BYTES
+to set a maximum allocation size.
+The large array free-list is replaced with individual allocations
+when a send/receiver buffer larger than 16KB is needed.
+Add new configuration parameter EPICS_CA_AUTO_MAX_ARRAY_BYTES which defaults to NO.
+libca and RSRV respect EPICS_CA_AUTO_MAX_ARRAY_BYTES=YES.
+PCAS ignores EPICS_CA_AUTO_MAX_ARRAY_BYTES=YES, and thus now ignores EPICS_CA_MAX_ARRAY_BYTES entirely.
+</p>
+
 <h3>Channel Access "modernization"</h3>
 
 <p>Drop support for CA clients advertising protocol versions less than 4.</p>