Update README.md

fieg · fieg · commit 6a7b7be8f734 · 2014-06-03T00:26:53.000+02:00
diff --git a/README.md b/README.md
@@ -2,3 +2,5 @@ Graph Search
 ============
 
 Implementation of a Graph Search algorithm in PHP.
+
+Based on the book [Artificial Intelligence - foundations of computational agents](http://artint.info) chapter [3 States and Searching](http://artint.info/html/ArtInt_46.html).
