T-SQL update an increasing value

I have a table with many columns, one column is called "aID" and currently has no value. I want to add an increasing value here, from 1 to the amount of rows in table.

UPDATE [xx].[dbo].[UserValues] 
SET aID = ??
Where aID is null

How can i do this?


Maybe query:

SET t.aID = t.Rn
             ROW_NUMBER() OVER(ORDER BY aID) AS Rn   
      FROM [xx].[dbo].[UserValues]
      WHERE aID is null) t

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