diff --git a/Understanding-the-Photos-database.md b/Understanding-the-Photos-database.md
index a2c11dd..46a4d13 100644
--- a/Understanding-the-Photos-database.md
+++ b/Understanding-the-Photos-database.md
@@ -31,6 +31,8 @@ The version is a 4-digit integer, the first digit of which signifies which versi
 * Photos 4.0 (10.14.6) == 4025
 * Photos 5.0 (10.15.0) == 6000
 
+Most of what is described in the following comes from reverse engineering what Photos is doing or looking at the code of [others](https://github.com/RhetTbull/osxphotos/wiki/Related-projects) who have done related work.  I had to make many, many assumptions and some of them are surely wrong.  If you discover any errors or have additional information to add I welcome edits to the wiki or opening an [issue](https://github.com/RhetTbull/osxphotos/issues)!
+
 Additional details about the Photos 5 database structure are [here](https://github.com/RhetTbull/osxphotos/wiki/Photos-version-5-database).
 
 Additional details about the Photos 4 database structure are [here](https://github.com/RhetTbull/osxphotos/wiki/Photos-version-4-database).