Index: asset.module
<+>UTF-8
===================================================================
--- asset.module	(revision 700181b35ceda399dc2a7d1eb1378a311ff0e4b2)
+++ asset.module	(revision 1a2b6766751e970f7533cd6a91e0038aded48a71)
@@ -536,8 +536,9 @@
  * Helper function to get supported field types.
  */
 function _assets_get_supported_field_types() {
-  // @todo: Provide a hook.
-  return array('text', 'text_long');
+  $types = array('text', 'text_long');
+  drupal_alter('asset_field_types', $types);
+  return $types;
 }
 
 /*