diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..73e311c
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,25 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 1.0.0
+
+### Added
+
+- add `logabstanh`
+
+### Changed
+
+- improve `log1pmx`, add `Float32` implementation
+- make tests have their own environment, use JET.jl and Aqua.jl
+- improve `_log1pmx_ker` internal documentation on the polynomial
+- improve accuracy of `logit`, `logcosh`
+- more detailed testing (`ULPError.jl`)
+- relax the doc string of `log2mexp` to promise just "careful evaluation", technically breaking
+
+## 0.3.29
+
+A changelog is not available up to this version.