diff --git a/sql/table_ddl.sql b/sql/table_ddl.sql
index d5db4e7..6a12e64 100644
--- a/sql/table_ddl.sql
+++ b/sql/table_ddl.sql
@@ -1,6 +1,8 @@
 
 -- table_ddl.sql
 
+-- see Object types for DBMS_METADATA (Doc ID 207859.1)
+
 @clears
 
 col v_owner new_value v_owner noprint
diff --git a/sql/user_ddl.sql b/sql/user_ddl.sql
index c5dc89d..3b6d63c 100644
--- a/sql/user_ddl.sql
+++ b/sql/user_ddl.sql
@@ -1,5 +1,7 @@
 
--- schema_ddl.sql
+-- user_ddl.sql
+
+-- see Object types for DBMS_METADATA (Doc ID 207859.1)
 
 @clears