Watermark batch of images

Hey all!
Let's assume you have a lot of images and you want to watermark all of them.
There are some online website that doing that, but when we are talking about a lot (for example 5000) of images this may be very slow.

So I thought to myself- why no to automate that?

I publish it as python package.
You can find the source code and "how to" guide here:
https://github.com/roybs2/watermark-image

Any comments, new ideas will be blessed.

Thanks and have a great week! :)