diff --git a/CHANGES.md b/CHANGES.md
index e4710a506..46989f9cf 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,7 +5,7 @@ Bugfixes
 --------
 
 - Fix regression in 1.1rc1 where OPTIONS requests to the media repo would fail. ([\#5593](https://github.com/matrix-org/synapse/issues/5593))
-- Removed the `SYNAPSE_SMTP_*` docker container environment variables. Using these environment variables prevented the docker container from starting in Synapse v1.0, even though they didn't actually allow any functionality anyway. Users are advised to remove `SYNAPSE_SMTP_HOST`, `SYNAPSE_SMTP_PORT`, `SYNAPSE_SMTP_USER`, `SYNAPSE_SMTP_PASSWORD` and `SYNAPSE_SMTP_FROM` environment variables from their docker run commands. ([\#5596](https://github.com/matrix-org/synapse/issues/5596))
+- Removed the `SYNAPSE_SMTP_*` docker container environment variables. Using these environment variables prevented the docker container from starting in Synapse v1.0, even though they didn't actually allow any functionality anyway. ([\#5596](https://github.com/matrix-org/synapse/issues/5596))
 - Fix a number of "Starting txn from sentinel context" warnings. ([\#5605](https://github.com/matrix-org/synapse/issues/5605))
 
 
diff --git a/changelog.d/5615.doc b/changelog.d/5615.doc
new file mode 100644
index 000000000..0fd45c66b
--- /dev/null
+++ b/changelog.d/5615.doc
@@ -0,0 +1 @@
+Change a previous changelog entry to suggest that people use a config file for Docker instead of env vars.