diff --git a/registry.json b/registry.json
index 9d6a96f..2e39dc9 100644
--- a/registry.json
+++ b/registry.json
@@ -6,6 +6,7 @@
   "md": "github:guybedford/system-md",
   "text": "github:systemjs/plugin-text",
 
+  "extra": "thing",
   "ace": "github:ajaxorg/ace-builds",
   "angular": "github:angular/bower-angular",
   "angular-animate": "github:angular/bower-angular-animate",