diff --git a/unraid/bookstack.xml b/unraid/bookstack.xml
index 318f2c5..23d6260 100755
--- a/unraid/bookstack.xml
+++ b/unraid/bookstack.xml
@@ -127,6 +127,7 @@ For more information on BookStack visit their website and check it out: https://
     <Config Name="WebUI" Target="80" Default="6875" Mode="tcp" Description="will map the container&#39;s port 80 to port 6875 on the host" Type="Port" Display="always" Required="true" Mask="false"/>
     <Config Name="Appdata" Target="/config" Default="" Mode="rw" Description="Persistent config files" Type="Path" Display="advanced" Required="true" Mask="false"/>
     <Config Name="APP_URL" Target="APP_URL" Default="" Description="The IP:port or URL your application will be accessed on (ie. `http://192.168.1.1:6875` or `https://bookstack.mydomain.com`" Type="Variable" Display="always" Required="true" Mask="false"/>
+    <Config Name="APP_KEY" Target="APP_KEY" Default="" Description="Session encryption key. Can be generated with `docker run -it --rm --entrypoint /bin/bash lscr.io/linuxserver/bookstack:latest appkey`" Type="Variable" Display="always" Required="true" Mask="true"/>
     <Config Name="DB_HOST" Target="DB_HOST" Default="" Description="The database instance hostname" Type="Variable" Display="always" Required="true" Mask="false"/>
     <Config Name="DB_PORT" Target="DB_PORT" Default="3306" Description="Database port (default `3306`)" Type="Variable" Display="always" Required="true" Mask="false"/>
     <Config Name="DB_USERNAME" Target="DB_USERNAME" Default="" Description="Database user" Type="Variable" Display="always" Required="true" Mask="false"/>