diff --git a/Photos-version-5-database.md b/Photos-version-5-database.md
index 0a973d3..9e8364a 100644
--- a/Photos-version-5-database.md
+++ b/Photos-version-5-database.md
@@ -1,2 +1,3 @@
 The full schema of the Photos 5 database is available [here](https://github.com/RhetTbull/osxphotos/wiki/Photos-5-database-schema).
 
+`PhotosDB._process_database5()` reads the `Photos.sqlite` file to extract all known metadata.