diff --git a/exercises/collections/README.md b/exercises/collections/README.md
index 0291bc8..b6d62ac 100644
--- a/exercises/collections/README.md
+++ b/exercises/collections/README.md
@@ -20,3 +20,4 @@ structures that are used very often in Rust programs:
 ## Further information
 
 - [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
+- [Storing Keys with Associated Values in Hash Maps](https://doc.rust-lang.org/book/ch08-03-hash-maps.html)