diff --git a/src/leveled_head.erl b/src/leveled_head.erl
index d6ffd4f..b096844 100644
--- a/src/leveled_head.erl
+++ b/src/leveled_head.erl
@@ -85,6 +85,7 @@
 
 
 -export_type([object_tag/0,
+                headonly_tag/0,
                 head/0,
                 object_metadata/0,
                 appdefinable_function_tuple/0]).