diff --git a/README.md b/README.md
index 746cfb8..9fdae2f 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@ A well documented, tried and tested Samba Active Directory Domain Controller tha
 
 ## Environment variables for quick start
 * `DOMAIN` defaults to `CORP.EXAMPLE.COM` and should be set to your domain
+* `WORKGROUP` defaults to `CORP` from `CORP.EXAMPLE.COM` but can be customized
 * `DOMAINPASS` should be set to your administrator password, be it existing or new. This can be removed from the environment after the first setup run.
 * `HOSTIP` can be set to the IP you want to advertise.
 * `JOIN` defaults to `false` and means the container will provision a new domain. Set this to `true` to join an existing domain.
diff --git a/init.sh b/init.sh
index 2203e24..d7c91a5 100755
--- a/init.sh
+++ b/init.sh
@@ -18,7 +18,7 @@ appSetup () {
 	
 	LDOMAIN=${DOMAIN,,}
 	UDOMAIN=${DOMAIN^^}
-	URDOMAIN=${UDOMAIN%%.*}
+	URDOMAIN=${WORKGROUP:-${UDOMAIN%%.*}}
 
 	# If multi-site, we need to connect to the VPN before joining the domain
 	if [[ ${MULTISITE,,} == "true" ]]; then