diff --git a/manual/docs/Object relational mapping - Hierarchical data - Adjacency list - Introduction.php b/manual/docs/Object relational mapping - Hierarchical data - Adjacency list - Introduction.php
new file mode 100644
index 000000000..e22100a60
--- /dev/null
+++ b/manual/docs/Object relational mapping - Hierarchical data - Adjacency list - Introduction.php	
@@ -0,0 +1 @@
+Not yet implemented
\ No newline at end of file