diff --git a/bookstack/DOCS.md b/bookstack/DOCS.md
index 36ed32b..f56a388 100644
--- a/bookstack/DOCS.md
+++ b/bookstack/DOCS.md
@@ -25,6 +25,9 @@ log_level: info
 ssl: false
 certfile: fullchain.pem
 keyfile: privkey.pem
+envvars:
+  - name: SESSION_COOKIE_NAME
+    value: bookstack_session
 ```
 
 **Note**: _This is just an example, don't copy and paste it! Create your own!_
@@ -91,6 +94,27 @@ Only applies if a remote MYSQL database is used, the password of the above user.
 Only applies if a remote MYSQL database is used, the port that the database
 server is listening on.
 
+### Option: `envvars`
+
+This allows the setting of Environment Variables to control Bookstack
+configuration as documented at:
+
+<https://www.bookstackapp.com/docs/>
+
+**Note**: _Changing these options can possibly cause issues with you instance.
+USE AT YOUR OWN RISK!_
+
+These are case sensitive and any items set by specific configuration will take
+precedence.
+
+#### Sub-option: `name`
+
+The name of the environment variable to set.
+
+#### Sub-option: `value`
+
+The value of the environment variable to set.
+
 ## Database usage
 
 By default, Bookstack will automatically use and configure the Home Assistant
diff --git a/bookstack/config.json b/bookstack/config.json
index b46ef70..66516e9 100644
--- a/bookstack/config.json
+++ b/bookstack/config.json
@@ -17,6 +17,7 @@
     "80/tcp": "Web interface"
   },
   "options": {
+    "envvars": [],
     "ssl": false,
     "certfile": "fullchain.pem",
     "keyfile": "privkey.pem"
@@ -31,6 +32,12 @@
     "log_level": "list(trace|debug|info|notice|warning|error|fatal)?",
     "certfile": "str",
     "keyfile": "str",
-    "ssl": "bool"
+    "ssl": "bool",
+    "envvars": [
+      {
+        "name": "str",
+        "value": "str"
+      }
+    ]
   }
 }
diff --git a/bookstack/rootfs/etc/services.d/php-fpm/run b/bookstack/rootfs/etc/services.d/php-fpm/run
index 9065ec0..471ec9d 100644
--- a/bookstack/rootfs/etc/services.d/php-fpm/run
+++ b/bookstack/rootfs/etc/services.d/php-fpm/run
@@ -11,6 +11,13 @@ export DB_PASSWORD
 export DB_PORT
 export DB_USERNAME
 
+for envvar in $(bashio::config 'envvars|keys'); do
+    name=$(bashio::config "envvars[${envvar}].name")
+    value=$(bashio::config "envvars[${envvar}].value")
+    bashio::log.debug "Setting Env Variable ${name} to ${value}"
+    export "${name}=${value}"
+done
+
 APP_KEY=$(cat /data/bookstack/appkey.txt)
 
 if bashio::config.has_value 'remote_mysql_host';then