--- a/web-search.rst	Sat Apr 14 13:56:41 2012 +0300
+++ b/web-search.rst	Sat Apr 14 14:00:28 2012 +0300
@@ -75,6 +75,14 @@
   http://www.technorati.com/
                 Very irrelevant or zero result.
 
+History of word/phrase occurrence.
+==================================
+
+  http://www.google.com/trends/
+                How often something searched through Google.
+  http://books.google.com/ngrams
+                Search of phrases in books from 1800 till now day.
+
 DuckDuckGo.
 ===========