diff --git a/docker/README.md b/docker/README.md
index b48d74e09c..df5d0151e2 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -102,8 +102,9 @@ when ``SYNAPSE_CONFIG_PATH`` is not set.
* ``SYNAPSE_SERVER_NAME`` (mandatory), the server public hostname.
* ``SYNAPSE_REPORT_STATS``, (mandatory, ``yes`` or ``no``), enable anonymous
statistics reporting back to the Matrix project which helps us to get funding.
-* ``SYNAPSE_NO_TLS``, set this variable to disable TLS in Synapse (use this if
- you run your own TLS-capable reverse proxy).
+* `SYNAPSE_NO_TLS`, (accepts `true`, `false`, `on`, `off`, `1`, `0`, `yes`, `no`]): disable
+ TLS in Synapse (use this if you run your own TLS-capable reverse proxy). Defaults
+ to `false` (ie, TLS is enabled by default).
* ``SYNAPSE_ENABLE_REGISTRATION``, set this variable to enable registration on
the Synapse instance.
* ``SYNAPSE_ALLOW_GUEST``, set this variable to allow guest joining this server.
@@ -160,7 +161,7 @@ specify values for `SYNAPSE_CONFIG_PATH`, `SYNAPSE_SERVER_NAME` and
example:
```
-docker run -it --rm
+docker run -it --rm \
--mount type=volume,src=synapse-data,dst=/data \
-e SYNAPSE_CONFIG_PATH=/data/homeserver.yaml \
-e SYNAPSE_SERVER_NAME=my.matrix.host \
|
