diff --git a/CHANGELOG.md b/CHANGELOG.md
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+++ b/CHANGELOG.md
@@ -1 +1,12 @@
 # Changelog
+All notable changes to this project will be documented in this file. Dates are displayed in UTC.
+
+# 1.0.0 (2021-08-25)
+
+
+### Features
+
+* add "module" property to package.json ([168747d](https://github.com/RebeccaStevens/deepmerge-ts/commit/168747daef0b49ab8ac3b0491fda965776eef2c2))
+* add basic functionality ([8e3ba66](https://github.com/RebeccaStevens/deepmerge-ts/commit/8e3ba66973d6e35cc421149a00a45b7c55c1de45))
+
+# Changelog