diff --git a/install.sh b/install.sh
index 98235a2..4267291 100644
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,12 @@
 #!/usr/bin/env bash
 set -eu
 
+if [ -z $URL ]; then
+  #URL="https://global.synologydownload.com/download/DSM/beta/7.2/64216/DSM_VirtualDSM_64216.pat"
+  #URL="https://global.synologydownload.com/download/DSM/release/7.0.1/42218/DSM_VirtualDSM_42218.pat"
+  URL="https://global.synologydownload.com/download/DSM/release/7.1.1/42962-1/DSM_VirtualDSM_42962.pat"
+fi
+
 IMG="/storage"
 BASE=$(basename "$URL" .pat)