# Update DocumentID provider prefix (excel/json)

Use this format to update the docid prefix in one or more site collections. The filename should contain DocIDPrefix and format is xls(x) or json.

The following columns can be used:

The url should contain a serverrelative url (start with /) pointing to the sitecollection root or specify a mattercode.

See this example for a json file to update a single matter

{
  "MatterCode": "2171",
  "Prefix": "2171"
}