I am just wondering how the "Discourage search engines from indexing this site' feature works. Here's what I mean. I was under the impression that if you tick the "Discourage search engines from indexing this site" option (in Settings -> Reading>, it'll add the following scripting in robots.txt:
so that all my site is blocked for search engines. Problem is, once I enable that feature, it does not change my robots.txt file. Now here's my questions. Which file or way that feature uses to discourage search engines from indexing my site?