[Question] changes required to be done to update script for new field to existing doctype

Hi all,
I have added a new field to existing doctype say customer and field custom_checkbox. I wish to do a PR and hence the new field should be available to people upgrading from last version say v8 to latest version v9. For that what are the steps to be done. Example (1)I have added entry to erpnext/patches.txt with line erpnext.patches.v9_0.set_custom_checkbox. (2)customer.json has the new field
Am i missing anything say…somewhere an update query on tabCustomer for people upgrading from 8->9. any advice? thanks