diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4397f5f..8da9319 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,21 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+## [v0.27.0] - 2021-09-24
+This release will add a new hashed index on `signature` for the `accessTokens`
+collection. This makes the old `accessTokens.idxSignatureId` index redundant and
+can be removed.
+
+### Added
+- mongo: migrates to using a hashed index for the signature index on access tokens.
+    - The signature for an access token could grow quite large, leading to a
+      large index.  By migrating to using a hashed index, the size can be
+      reduced to 2% of the original indices size. In our testing we went from
+      2.8GB -> 57MB.
+
+### Fixed
+- examples/mongo/authorizationserver: removes `mongo-features` example.
+
 ## [v0.26.0] - 2021-08-05
 ### Added
 - utils: adds functions to help with adding and removing items from string sets.
@@ -626,6 +641,7 @@ clear out the password field before sending the response.
 - General pre-release!
 
 [Unreleased]: https://github.com/matthewhartstonge/storage/tree/master
+[v0.27.0]: https://github.com/matthewhartstonge/storage/tree/v0.27.0
 [v0.26.0]: https://github.com/matthewhartstonge/storage/tree/v0.26.0
 [v0.25.1]: https://github.com/matthewhartstonge/storage/tree/v0.25.1
 [v0.25.0]: https://github.com/matthewhartstonge/storage/tree/v0.25.0
diff --git a/README.md b/README.md
index 8176e1a..92884f6 100644
--- a/README.md
+++ b/README.md
@@ -18,11 +18,11 @@ know what versions you are successfully paired with.
 
 | storage version | minimum fosite version | maximum fosite version | 
 |----------------:|-----------------------:|-----------------------:|
+|       `v0.27.X` |              `v0.32.X` |              `v0.34.X` |
 |       `v0.26.X` |              `v0.32.X` |              `v0.34.X` |
 |       `v0.25.X` |              `v0.32.X` |              `v0.34.X` |
 |       `v0.24.X` |              `v0.32.X` |              `v0.32.X` |
 |       `v0.22.X` |              `v0.32.X` |              `v0.32.X` |
-|       `v0.21.X` |              `v0.31.X` |              `v0.31.X` |
 
 ## Development
 To start hacking: