diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 000000000..a2ad2cffc
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,50 @@
+# What's New
+
+**name-suggestion-index** is an open source project. You can submit bug reports, help out,
+or learn more by visiting our project page on GitHub:  :octocat: https://github.com/osmlab/name-suggestion-index
+
+Please star our project on GitHub to show your support! ⭐️
+
+_Breaking changes, which may affect downstream projects, are marked with a_ ⚠️
+
+
+<!--
+# A.B.C
+##### YYYY-MMM-DD
+
+* Added resources:
+* Added events:
+* Updated:
+
+[#xxxx]: https://github.com/osmlab/name-suggestion-index/issues/xxxx
+-->
+
+# 6.0.YYYYMMDD
+##### 2021-Jun-24
+* Bump to location-conflation v1.0.2 / country-coder v5.0.3
+* ⚠️  Replace rollup/parcel/babel with [esbuild](https://esbuild.github.io/) for super fast build speed. Package exports are now:
+  * `"module": "./index.mjs"` - ESM, modern JavaScript, works with `import`
+  * `"main": "./dist/javascript/nsi.cjs"` - CJS bundle, modern JavaScript, works with `require()`
+  * `Matcher()` is a class now.  Instantiate it like: `matcher = new Matcher();`
+  * No longer distributing ES5 builds
+* ⚠️  name-suggestion-index is marked as `"type": "module"` now
+* ⚠️  Dropped support for old browsers like Internet Explorer on https://nsi.guide
+
+
+# 5.0.YYYYMMDD
+##### 2021-Mar-22
+* ⚠️  Significant refactor ([#4543], [#4964]):
+  * Add support for multiple trees (brands, operators, flags, transit) ([#4231], [#4745])
+  * Major changes to the name matching code, match generic patterns too ([#4924])
+  * Change file format to store per-category exclude patterns ([#4906])
+  * Add support for generated unique identifiers ([#3995])
+  * Add support for template-generated categories ([#2883])
+
+[#2883]: https://github.com/osmlab/name-suggestion-index/issues/2883
+[#3995]: https://github.com/osmlab/name-suggestion-index/issues/3995
+[#4231]: https://github.com/osmlab/name-suggestion-index/issues/4231
+[#4543]: https://github.com/osmlab/name-suggestion-index/issues/4543
+[#4745]: https://github.com/osmlab/name-suggestion-index/issues/4745
+[#4906]: https://github.com/osmlab/name-suggestion-index/issues/4906
+[#4924]: https://github.com/osmlab/name-suggestion-index/issues/4924
+[#4964]: https://github.com/osmlab/name-suggestion-index/issues/4964
diff --git a/package.json b/package.json
index 0c52f9317..a40aa8024 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "name-suggestion-index",
-  "version": "5.0.20210623",
+  "version": "6.0.20210624",
   "license": "BSD-3-Clause",
   "repository": "github:osmlab/name-suggestion-index",
   "contributors": [