I was recently monitoring my server logs and I noticed multiple requests to a unusual path.
/humans.txt. The request returned a 404 since it didn't exist but it got my attention. A few seconds of googling revealed a very interesting idea: a website can talk to bots with the robots.txt file and talk to humans with humans.txt.
Humanstxt.org We are People, Not Machines
Because it's something simple and fast to create. Because it's not intrusive with the code. More often than not, the owners of the site don't like the authors signing it; they claim that doing so may make the site less efficient. By adding a txt file, you can prove your authorship (not your property) in an external, fast, easy and accessible way.
I decided to add it to my sites even though I am mostly doing everything on my own, plus it is not intrusive. One thing though, I may slip some html into it because .txt is not the most human friendly format.