--- a/web-seo.rst	Thu Feb 23 21:41:59 2017 +0200
+++ b/web-seo.rst	Fri Feb 24 11:49:49 2017 +0200
@@ -196,6 +196,13 @@
   <meta name="robots" content="index, nofollow">
   <meta name="robots" content="index, follow">
 
+https://support.google.com/webmasters/answer/93710
+  Block search indexing with meta tags.
+http://www.robotstxt.org/meta.html
+  About the Robots ``<META>`` tag.
+https://en.wikipedia.org/wiki/Noindex
+  Wikiperia article.
+
 rel nofollow attribute in link
 ==============================