Adding a field to Project

Hello,

I need to add 1 field for each project. Is it bad form to write a migration that adds a column to the issues table? Instead is it preferred to make a new table that :belongs_to :issues and add the field via a join? The former makes the most sense to do, but i feel like altering the table structure is bad form (could conflict w/ later upgrades, etc).

Thanks in advance!
Adam