While on many sites personal notes about users began to appear, there is still no such opportunity on habrahabr. But putting + or - the user then almost did not remember what and why. There is also nowhere to write any additional data about the user, which he, for example, did not write in the profile, but told in some comments. As a result, I had to write a user script -
userscripts.org/scripts/show/96400 (sometimes userscripts are disabled and then the script can be installed via a direct link:
userscripts.org/scripts/source/96400.user.js ).
This script adds this feature by itself, saving notes in your browser (in localstorage). Of course, if you clean the localstorage, everything will sink into oblivion, but there is no better solution yet, so you have to be content with what you have.
The script was tested in Google Chrome and FireFox, in Opere it should work without problems, and maybe in IE8 it can (there is support for localstorage and addon which allows users to load userscripts).
It will look like this:

Now under the username there will be a gray rectangle with a note by clicking on which a field for editing will appear. If you wrote everything correctly - press Enter or click somewhere on the page. If you change your mind - Escape.
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It seems like everything. Yes, maybe it looks crooked, but I'm not a web developer at all. Suggest what to fix - I will be glad.
Enjoy