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@@ -88,6 +88,18 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# Upgrading to v1.76.0
+
+## Changes to the account data replication streams
+
+Synapse has changed the format of the account data replication streams (between
+workers). This is a forwards- and backwards-incompatible change: v1.75 workers
+cannot process account data replicated by v1.76 workers, and vice versa.
+
+Once all workers are upgraded to v1.76 (or downgraded to v1.75), account data
+replication will resume as normal.
+
+
 # Upgrading to v1.74.0
 
 ## Unicode support in user search