box timing

I am going to take the camshaft crankshaft pulley off to change the timing and all other belts. Right now it is at TDC. Is the pulley shaft notched or something so that the pulley will be in the correct orientation when you put it back on the shaft? I figured it had to be but I can't tell...

I guess it has been a while. In fact I may be fuzzy on the procedure, it's been so long. Can someone remind me of the pit falls of timing belt and tensioner replacement. The manuals are vague on critical points as I recall.