--geometry doesn't affect image position

[Powersource]

Adding --geometry 500x500 changes the window size but I seem to be unable to get the position to change. The syntax I use is --geometry 1000x1000+500+0
This might just be me being stupid but in that case maybe expand with example usage in the man-page since I couldn't find much info on this.
Using version 1.88

[kohler]

That is the right argument. It depends on your window manager, though, whether the argument is obeyed. I've verified that the argument works OK on mac os and ubuntu.