diff --git a/README.md b/README.md
index 891b77ae..4a63bfe9 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,8 @@ See [CHANGELOG.md](CHANGELOG.md) for full details and the [v6.0.0 release](https
 ## Features
 
 - Primitives, arrays, maps, structs, time.Time and interface{}.
+- Struct fields that are not exported (their names start with a lowercase letter) are
+  ignored during encoding and decoding, just like `encoding/json`.
 - Appengine \*datastore.Key and datastore.Cursor.
 - [CustomEncoder]/[CustomDecoder] interfaces for custom encoding.
 - [Extensions](https://pkg.go.dev/github.com/Basekick-Labs/msgpack/v6#example-RegisterExt) to encode