Now you can leave comments on this blog.

The comments feature is implemented by disqus. It has good documentation, so you can easily follow the process. In brief, (1) you need to make an account in disqus.com and do some configuration and (2) edit _config.yml file, _includes/disqus_comments.html file. (If there is no such file in _includes directory, check the _layouts/post.html file; there would be {%- include disqus_comments.html -%}-like code in it, and this line tells you what file you have to edit.

Why do we need another platform like disqus?

Github page is a static website hosting service; this means that, all of the codes in this blog are fixed for each git push. So leaving the comment (without git push) will not be possible in github page itself. So we need third party plug-in for comments.