diff --git a/guava21/README.md b/guava21/README.md
index 2a54416e41..68c1ac4a8e 100644
--- a/guava21/README.md
+++ b/guava21/README.md
@@ -1,3 +1,4 @@
 ### Relevant articles:
 - [New Stream, Comparator and Collector Functionality in Guava 21](http://www.baeldung.com/guava-21-new)
 - [New in Guava 21 common.util.concurrent](http://www.baeldung.com/guava-21-util-concurrent)
+- [Zipping Collections in Java](http://www.baeldung.com/java-collections-zip)