diff --git a/Schema-Changes-from-Photos-5-to-Photos-6.md b/Schema-Changes-from-Photos-5-to-Photos-6.md
index 9a46b57..7f8f249 100644
--- a/Schema-Changes-from-Photos-5-to-Photos-6.md
+++ b/Schema-Changes-from-Photos-5-to-Photos-6.md
@@ -1,6 +1,6 @@
 Following data from Photos Version 6.0 (300.8.140) on Big Sur version 11.0 Beta (20A5343j)
 
-Primary Key Changes from Photos 5 to Photos 6
+Primary Key Changes from Photos 5 to Photos 6 (read as a diff: - == row deleted, + == row added)
 
  Z_ENT|Z_NAME
 ---|---