diff --git a/README.md b/README.md
index 0d64836a..200e5d64 100644
--- a/README.md
+++ b/README.md
@@ -1410,6 +1410,7 @@ _Libraries for working with JSON._
 - [jzon](https://github.com/zerosnake0/jzon) - JSON library with standard compatible API/behavior.
 - [kazaam](https://github.com/Qntfy/kazaam) - API for arbitrary transformation of JSON documents.
 - [mapslice-json](https://github.com/mickep76/mapslice-json) - Go MapSlice for ordered marshal/ unmarshal of maps in JSON.
+- [marshmallow](https://github.com/PerimeterX/marshmallow) - Performant JSON unmarshaling for flexible use cases.
 - [mp](https://github.com/sanbornm/mp) - Simple cli email parser. It currently takes stdin and outputs JSON.
 - [OjG](https://github.com/ohler55/ojg) - Optimized JSON for Go is a high performance parser with a variety of additional JSON tools including JSONPath.
 - [omg.jsonparser](https://github.com/dedalqq/omg.jsonparser) - Simple JSON parser with validation by condition via golang struct fields tags.