diff --git a/CHANGES.md b/CHANGES.md
index fbea07306..92fb7cfb9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -20,6 +20,7 @@ This file is a best-effort approach to solving this issue; we will do our best b
 * (wifi) Changes have been made to the `WifiRemoteStationManager` interface for what concerns the update of the frame retry count of the MPDUs and the decision of dropping MPDUs (possibly based on the max retry limit). The `NeedRetransmission` method has been replaced by the `GetMpdusToDropOnTxFailure` method and the `DoNeedRetransmission` method has been replaced by the `DoGetMpdusToDropOnTxFailure` method. Also, the `DoIncrementRetryCountOnTxFailure` method has been added to implement custom policies for the update of the frame retry count of MPDUs upon transmission failure.
 * (applications) Added an `OnOffState` trace source to `OnOffApplication`, to track whether the application is transmitting or not.
 * (zigbee) Added Zigbee module support. The module includes a NWK layer with joining and routing capabilities. No APS layer included.
+* (antenna) Add `SymmetricAdjacencyMatrix` utility class, used to track the necessity of channel state between every `PhasedArrayModel` pair.
 
 ### Changes to existing API
 
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index d4beb43c5..95634adb8 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -60,6 +60,7 @@ The required Doxygen version for documentation generation is version 1.11.
 - (wifi) Clear PSDU map if no immediate response expected with BAR-BA ack sequence
 - (wifi) Fix S-MPDU TX duration computation with BlockAck ack policy
 - (wifi) Fix missing DSSS Param Set in Probe Request sent over 2.4 GHz links
+- (spectrum) Trigger 3GPP channel updates after changes to antenna attributes
 
 ## Release 3.43