diff --git a/ChangeLog.d/gcm-update.txt b/ChangeLog.d/gcm-update.txt
index 0fffd094d..858bd0a73 100644
--- a/ChangeLog.d/gcm-update.txt
+++ b/ChangeLog.d/gcm-update.txt
@@ -15,3 +15,5 @@ Features
    * The multi-part GCM interface (mbedtls_gcm_update() or
      mbedtls_cipher_update()) no longer requires the size of partial inputs to
      be a multiple of 16.
+   * The multi-part GCM interface now supports chunked associated data through
+     multiple calls to mbedtls_gcm_update_ad().