diff --git a/setup.sh b/setup.sh
index bb81e97..86b9a83 100755
--- a/setup.sh
+++ b/setup.sh
@@ -2,6 +2,11 @@
 
 _main() {
     opts="$@"
+
+    if [ -z "$opts" ] ; then
+        _help
+    fi
+
     for o in $opts ; do
         case "$o" in
             g)