diff --git a/algorithms/README.md b/algorithms/README.md
index 753126e..cede384 100644
--- a/algorithms/README.md
+++ b/algorithms/README.md
@@ -335,7 +335,7 @@ https://github.com/chrishwiggins/mise/blob/1a5a3e557bd38fbb11c7771ffe3725104c481
 - [many examples](http://scikit-learn.org/0.11/auto_examples/index.html)
 
 ### a book
-- [a book](http://www.packtpub.com/mastering-machine-learning-with-scikit-learn/book)
+- [a book](http://www.packtpub.com/big-data-and-business-inteliigence/building-machine-learning-systems-python)
 - [a code set associated with this book](https://github.com/luispedro/BuildingMachineLearningSystemsWithPython)