doc UPDATE note about mounted data creation
diff --git a/src/tree_data.h b/src/tree_data.h
index a5397b8..e1f0d8a 100644
--- a/src/tree_data.h
+++ b/src/tree_data.h
@@ -202,6 +202,8 @@
  * need to be provided by a callback:
  *
  * - ::ly_ctx_set_ext_data_clb()
+ *
+ * The mounted data can be parsed directly from data files or created manually using the standard functions.
  */
 
 /**