diff --git a/images/docker-hedgedoc.md b/images/docker-hedgedoc.md
index 3fbe4e674..d334bafa6 100755
--- a/images/docker-hedgedoc.md
+++ b/images/docker-hedgedoc.md
@@ -106,6 +106,7 @@ docker run -d \
   -e TZ=Europe/London \
   -e CMD_DOMAIN=localhost \
   -e CMD_URL_ADDPORT=true `#optional` \
+  -e CMD_PROTOCOL_USESSL=false `#optional` \
   -p 3000:3000 \
   -v /path/to/appdata:/config \
   --restart unless-stopped \
@@ -136,6 +137,7 @@ Docker images are configured using parameters passed at runtime (such as those a
 | `TZ=Europe/London` | Specify a timezone to use EG Europe/London. |
 | `CMD_DOMAIN=localhost` | The address the gui will be accessed at (ie. `192.168.1.1` or `hedgedoc.domain.com`). |
 | `CMD_URL_ADDPORT=true` | Set to `false` if accessing at port `80` or `443`. |
+| `CMD_PROTOCOL_USESSL=false` | Set to `true` if accessing over https via reverse proxy. |
 
 ### Volume Mappings (`-v`)
 
@@ -197,6 +199,7 @@ We publish various [Docker Mods](https://github.com/linuxserver/docker-mods) to
 
 ## Versions
 
+* **09.12.21:** - Add optional var `CMD_PROTOCOL_USESSL` that is needed for reverse proxy.
 * **07.12.21:** - Rebase to ubuntu focal. Update to node 16. Make sure uploads are persistent.
 * **15.10.21:** - Add required env var `CMD_DOMAIN`.
 * **05.05.21:** - Remove symlinking some folders from config to /opt/hedgedoc/public.