Add additional codes, 4601 & 6594

README.md

@@ -6,6 +6,21 @@ Re-initialised in a new repository on 04/12/2025.  This decision was made to kee
 
 Data is prepared for the data-ingress service using Gitea actions, any changes made to the actions require care to ensure it doesn't break the ingress of data to OwlBoard.
 
+## Making Changes
+
+Updates should be made in a branch following the naming pattern:
+
+```
+branches:
+- auto-*
+- pis-*
+```
+
+Updated should be placed in to a new file in the /pis/ directory.
+
+Code deletions must be made in the 'main' branch.
+
+
 ## Future Considerations
 
 Adding traction type field to cover 80x generic headcodes, and whatever 175's use if not the same as other units.