diff --git a/.config/redis.config.php b/.config/redis.config.php
index 8f4b7ec..5df799f 100644
--- a/.config/redis.config.php
+++ b/.config/redis.config.php
@@ -5,6 +5,7 @@ if (getenv('REDIS_HOST')) {
     'memcache.locking' => '\OC\Memcache\Redis',
     'redis' => array(
       'host' => getenv('REDIS_HOST'),
+      'port' => getenv('REDIS_HOST_PORT') ?: 6379,
     ),
   );
 }
diff --git a/README.md b/README.md
index 72b42f1..23e2fa6 100644
--- a/README.md
+++ b/README.md
@@ -133,6 +133,7 @@ The install and update script is only triggered when a default command is used (
 If you want to use Redis you have to create a seperate [Redis](https://hub.docker.com/_/redis/) container in your setup / in your docker-compose file. To inform Nextcloud about the Redis container add:
 
 - `REDIS_HOST` (not set by default) Name of Redis container
+- `REDIS_HOST_PORT` (default: _6379_) Optional port for Redis, only use for external Redis servers that run on non-standard ports.
 
 The use of Redis is recommended to prevent file locking problems. See the examples for further instructions.