Entity Framework (ASP.NET): How do you update the column mapping after adding a column to the framework?

I added a column to the Entity and then I go to generate the database from the model or build the solution and I get the message that the new column I just added is not mapped. The database was previously created from the model with no errors.

When I right click on the Entity and select Table Mapping, I can see the old columns there mapped but I don't see a way to m