What's crazy is that it is so easy to add another tab on the plugin info page on wordpress.org. It all comes from the readme file, and the example even shows ho to do it. I think the problem though is that in that example file, a change log tab isn't suggested, so maybe plugin authors don't think to do it. Maybe the example readme should be changed to include it?

I'll be putting a new tab too on the next update of my new user email plugin!
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