diff --git a/Photos-version-5-database.md b/Photos-version-5-database.md
index 2014afd..50c2001 100644
--- a/Photos-version-5-database.md
+++ b/Photos-version-5-database.md
@@ -53,6 +53,17 @@ Import sessions are stored in `ZGENERICALBUM` with 'ZKIND = 1506`.  When a photo
 
 In Photos 5, the import order is stored in a similar manner as the discussion above on album sort order.  The value in `ZGENERICASSET.Z_FOK_IMPORTSESSION` defines the sort order for an import session.  In Photos 6, `ZGENERICASSET` is renamed `ZASSET` and it no longer contains the the `Z_FOK_IMPORTSESSION` column.  I've not yet determined how Photos 6 stores the import order.
 
+## ZINTERNALRESOURCE
+
+Appears to contain additional information on every resource (e.g. original, edited, thumbnail) in the database.
+
+- `ZDATASTORESUBTYPE`: type of the resource
+  - 1: original
+  - 2: edited
+  - 3: cloud resource
+  - 17: raw
+
+
 **TODO** Document the following
 
 * [ ] Joining assets