diff --git a/mige.sh b/mige.sh
index 15794e6..6495511 100755
--- a/mige.sh
+++ b/mige.sh
@@ -18,10 +18,11 @@ check_files () {
 }
 
 read_options() {
-    while getopts "a" opt; do
+    while getopts "ad:" opt; do
         case "${opt}" in
             a) OPTION_ASSETS=true;;
-            \?) ;;
+            d) SOURCEDIR=$OPTARG;;
+            \?) exit 2;;
         esac
     done
 }