Update change log.

CHANGES.md

@@ -28,6 +28,16 @@ creating a new release entry be sure to copy & paste the span tag with the
 `actions:bind` attribute, which is used by a regex to find the text to be
 updated. Only the first match gets replaced, so it's fine to leave the old
 ones in. -->
+
+-------------------------------------------------------------------------------
+## __cylc-8.1.0 (<span actions:bind='release-date'>Upcoming</span>)__
+
+### Enhancements
+
+[#5032](https://github.com/cylc/cylc-flow/pull/5032) - set a default limit of
+100 for the "default" queue.
+
+
 -------------------------------------------------------------------------------
 ## __cylc-8.0.0 (<span actions:bind='release-date'>Released 2022-07-28</span>)__