diff --git a/SETUP/CHANGELOG.md b/SETUP/CHANGELOG.md
index 21475230a..1d1039abd 100644
--- a/SETUP/CHANGELOG.md
+++ b/SETUP/CHANGELOG.md
@@ -7,13 +7,30 @@ see the git history.
 [R202009](https://github.com/DistributedProofreaders/dproofreaders/releases/tag/R202009)
 first before upgrading to R202102 or later releases.**
 
-## R??????
+## R202409
 Scripts supporting this upgrade are in `SETUP/upgrade/21`
 
-**This is the last release to support PHP 7.4. Future releases will only
-support PHP 8.0 and later.**
+### Notices & Deprecations
+
+This is the last release to support PHP 7.4. Future releases will only
+support PHP 8.1 and later.
+
+This is the last release to support the Hieroglyphs tool. WikiHiero which backs
+the tool has been unsupported for 20+ years and was written for PHP 4.3.3.
+
+### Changes
 
 * Updated minimum middleware to MySQL 8.0 (cpeel)
+* The deprecated globals mentioned in the last release notes were removed (cpeel)
+* Most `faq/*` content has been deleted (cpeel)
+* A `metadata.json` file has replaced `dc.xml` in the project directory (cpeel)
+* New API endpoints for proofreading (70ray)
+* Cronjobs now run through common interface with SA UI to show job status (cpeel)
+* Typing added to numerous functions and classes (bpfoley, jchaffraix)
+* XML feed types removed and feed backend improved (mrducky4)
+* Navigation bar updates for smaller screens (cpeel)
+* New site search page (cpeel)
+* `past_tallies` is now a sparse table (cpeel)
 
 ## R202403
 Scripts supporting this upgrade are in `SETUP/upgrade/20`
diff --git a/SETUP/UPGRADE.md b/SETUP/UPGRADE.md
index 2020cc18f..359f1b980 100644
--- a/SETUP/UPGRADE.md
+++ b/SETUP/UPGRADE.md
@@ -117,6 +117,7 @@ Run the scripts in the following directories in order
 * c/SETUP/upgrade/18/
 * c/SETUP/upgrade/19/
 * c/SETUP/upgrade/20/
+* c/SETUP/upgrade/21/
 
 ### Upgrading from release R202102
 Run the scripts in the following directories in order
@@ -126,6 +127,7 @@ Run the scripts in the following directories in order
 * c/SETUP/upgrade/18/
 * c/SETUP/upgrade/19/
 * c/SETUP/upgrade/20/
+* c/SETUP/upgrade/21/
 
 ### Upgrading from release R202109
 Run the scripts in the following directories in order
@@ -134,6 +136,7 @@ Run the scripts in the following directories in order
 * c/SETUP/upgrade/18/
 * c/SETUP/upgrade/19/
 * c/SETUP/upgrade/20/
+* c/SETUP/upgrade/21/
 
 ### Upgrading from release R202202
 Run the scripts in the following directories in order
@@ -141,17 +144,25 @@ Run the scripts in the following directories in order
 * c/SETUP/upgrade/18/
 * c/SETUP/upgrade/19/
 * c/SETUP/upgrade/20/
+* c/SETUP/upgrade/21/
 
 ### Upgrading from release R202209 or R202303
 Run the scripts in the following directories in order
 
 * c/SETUP/upgrade/19/
 * c/SETUP/upgrade/20/
+* c/SETUP/upgrade/21/
 
 ### Upgrading from release R202309
 Run the scripts in the following directories in order
 
 * c/SETUP/upgrade/20/
+* c/SETUP/upgrade/21/
+
+### Upgrading from release R202403
+Run the scripts in the following directories in order
+
+* c/SETUP/upgrade/21/
 
 ## Install the modified `dp.cron`
 Install the modified `dp.cron`.