Using STUFF get multiple column Names in sing string in sql server

//// Sql

DECLARE @cols AS NVARCHAR(MAX),@Flg varchar(10)='18'

select @cols = STUFF((SELECT distinct ',[' + Description + ']' FROM mstLookup where lookupflag=@Flg FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)') ,1,1,'')

print @cols

//// Result