diff --git a/cli.php b/cli.php
index aa30f0c..47b66fb 100644
--- a/cli.php
+++ b/cli.php
@@ -39,6 +39,7 @@ class cli
         echo "  $launcher -expert <class> <method> [args]\n";
         echo "     execute the method with the provided args\n";
         echo "You can replace ONE arg by a dash (-) to read from stdin\n";
+        echo "Arrays must be coded like key1=val1&key2=val2&key3=val3...\n";
         exit;
     }