diff --git a/bhl_macro.inc.php b/bhl_macro.inc.php
new file mode 100644
index 0000000..9eb5f18
--- /dev/null
+++ b/bhl_macro.inc.php
@@ -0,0 +1,19 @@
+<?php
+
+/**
+ * @global
+ */
+function macro_BHL_REF($proc, $mod_name, $func, $signature_json = '')
+{
+  //validate signature only if it's explicitely passed
+  if($signature_json)
+  {
+    $signature = json_decode($signature_json, false);
+    if(!is_array($signature))
+      throw new Exception("Signature is invalid '$mod_name'");
+    \taskman\bhl_validate_func_ref($mod_name, $func, $signature);
+  }
+
+  return array('module' => ltrim($mod_name, '/'), 'fn' => $func);
+}
+