diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a13076f..b1bb73ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## Experimental API
+
+### Changes
+
+- [Allow to create observable instruments without passing callback arguments](https://github.com/open-telemetry/opentelemetry-erlang/pull/604)
+
+## Experimental SDK
+
+### Added
+
+- [Add `instrument_unit` to view criteria](https://github.com/open-telemetry/opentelemetry-erlang/pull/604)
+- [Validate instrument name](https://github.com/open-telemetry/opentelemetry-erlang/pull/604)
+
 ## SDK 1.3.1 - 2023-08-15
 
 ### Added