diff --git a/bin/qemush b/bin/qemush
index af27a66..1d6da94 100755
--- a/bin/qemush
+++ b/bin/qemush
@@ -151,6 +151,10 @@ public_cat() {
 
 # Copy a file in entrypoints folder
 public_add() {
+    if [ -z "$1" ]; then
+        perror "specify the path of a launching script you want to add"
+        return 1
+    fi
 
     if [ -n "$2" ]; then
         name="$2"