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diff --git a/contrib/docker/README.md b/contrib/docker/README.md

index 05254e5192..af102f7594 100644
--- a/contrib/docker/README.md
+++ b/contrib/docker/README.md
@@ -1,5 +1,9 @@
 # Synapse Docker
 
+FIXME: this is out-of-date as of
+https://github.com/matrix-org/synapse/issues/5518. Contributions to bring it up
+to date would be welcome.
+
 ### Automated configuration
 
 It is recommended that you use Docker Compose to run your containers, including