diff --git a/data_files/project_child_collection.md b/data_files/project_child_collection.md
index 67f2f60..c8450e0 100644
--- a/data_files/project_child_collection.md
+++ b/data_files/project_child_collection.md
@@ -7,5 +7,5 @@ parent : [project](project_XML)
 attribute : none
 
 ## child elements
- *  [category](project_collection_child_category)
+ *  category _(not yet documented)_