One of the most powerful things you can leave behind is more than just assets in life. Adding a charity Hatfield in your will is an expression of your values.
Include a clear clause in your will outlining the cetain amount or percentage of the estate you want to leave to the charity. If you have specific plans.
Ask an attorney to include a specific clause in your will that articulates either the exact amount of money, or percentage of final estate you would like the charity receive.