Photoshop CS2 (1 Viewer)

[varsang]

I am trying to draw an arc with a pen tool. When I draw the first curve with the first two points it is fine, but the third straight point also draws as a curve. How can I fix that? I know there is a way in the top tools setting area but I do not know which one.

 

[Bodisathva]

first click = start point.
second click = end point.
instead of clicking the second point, click and drag to produce the desired curve