Why does MonoGame calls DoUpdate() before RunLoop()?

@GaijinFox wrote:

I am reading the source code to learn how MonoGame works internally, and in the Run(GameRunBehavior) method of the Game class I noticed the following:

 case GameRunBehavior.Synchronous:
                    // XNA runs one Update even before showing the window
                    DoUpdate( new GameTime() );

                    Platform.RunLoop();
                    EndRun();
                    DoExiting();
                    break;

There's DoUpdate()

Later on, inside the Platform.RunLoop() it calls Game.Tick(), which then calls internally DoUpdate() again

From what I understand, it gets on an endless game loop on Platform.RunLoop() until the user quits the game.

But why is it required to run that isolated DoUpdate() before it gets on the loop?

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