diff --git a/README.md b/README.md
index e77cc70..9f24afb 100644
--- a/README.md
+++ b/README.md
@@ -185,6 +185,7 @@ A curated list of awesome Java frameworks, libraries and software.
 *Efficient and specific data structures.*
 
 * [Apache Parquet](http://parquet.apache.org/) - Columnar storage format based on assembly algorithms from the Dremel paper by Google.
+* [Persistent Collection](http://pcollections.org/) - Persistent and immutable analogue of the Java Collections Framework.
 * [Protobuf](https://github.com/google/protobuf) - Google's data interchange format.
 * [SBE](https://github.com/real-logic/simple-binary-encoding) - Simple Binary Encoding, one of the fastest message formats around.
 * [Wire](https://github.com/square/wire) - Clean, lightweight protocol buffers.