Hi I'm an avid member of the stack-exchange sites.
As a history major I love the idea of a history Q&A site and the formatting, style and overall design of the Stack-exchange sites presents a friendly interface and a beautiful layout.
But as a member of Stack-Overflow and other sites I don't seem to have a "comment" button on the History Stack-exchange. I can't tell if this is an individual or localized bug or just a feature not available on History Stack Exchange?
Quick update
below I've attached some screen shots from my machine. as you can see there are no comment buttons in the history stack exchange site (1st picture) but there are comment buttons on my Stack Overflow account.