diff --git a/Admin/Release/CHECKLIST b/Admin/Release/CHECKLIST
--- a/Admin/Release/CHECKLIST
+++ b/Admin/Release/CHECKLIST
@@ -1,97 +1,99 @@
 Checklist for official releases
 ===============================
 
 - check latest updates of polyml, jdk, scala, jedit;
 
 - check Admin/components;
 
 - test "isabelle dump -b Pure ZF";
 
 - test "isabelle build -o export_theory -f ZF";
 
 - test "isabelle server" according to "system" manual;
 
 - test Isabelle/VSCode;
 
 - test Isabelle/jEdit: print buffer
 
 - test "#!/usr/bin/env isabelle_scala_script";
 
 - test Windows 10 subsystem for Linux:
   https://docs.microsoft.com/en-us/windows/wsl/install-win10
 
 - check (non-)executable files:
     $ find . "(" -name "*.thy" -o -name "*.ML" -o -name "*.scala" -o -name ROOT ")" -executable
     $ find -type f -executable
 
 - check sources:
     isabelle check_sources '~~' '$AFP_BASE'
 
 - check ANNOUNCE, README, NEWS, COPYRIGHT, CONTRIBUTORS;
 
 - check versions:
     src/Tools/jEdit/src/Isabelle.props
     src/Tools/jEdit/src-base/Isabelle_Base.props
 
 - check Isabelle version:
     src/Tools/VSCode/extension/README.md
     src/Tools/VSCode/extension/package.json
 
 - check funny base directory, e.g. "Test 中国";
 
 - diff NEWS wrt. last official release, which is read-only;
 
 - update https://isabelle.sketis.net/repos/isabelle-website
 
 - check doc/Contents, src/Tools/jEdit/dist/doc/Contents;
 
 - test old HD display: Linux, Windows, macOS;
 
 - macOS: check recent MacTeX;
 
 - Windows: check recent MiKTeX;
 
 - Phabricator:
     . src/Doc/System/Phabricator.thy: check/update underlying Ubuntu version
     . etc/options: check/update phabricator_version entries;
 
 
 Repository fork
 ===============
 
 - isabelle: finalize NEWS / CONTRIBUTORS -- proper headers for named release;
 
 - isabelle-release: hg tag;
 
 - isabelle: back to post-release mode -- after fork point;
 
 
 Packaging
 =========
 
 - macOS: provide "gnutar" executable via shell PATH
   (e.g. copy of /usr/bin/gnutar from Mountain Lion)
 
 - fully-automated packaging (e.g. on lxcisa0):
 
   hg up -r DISTNAME && Admin/build_release -b HOL -l -O -R DISTNAME /home/isabelle/dist
 
 - Docker image:
 
   isabelle build_docker -o Dockerfile -E -t makarius/isabelle:Isabelle2021 Isabelle2021_linux.tar.gz
 
   docker login
 
   docker push makarius/isabelle:Isabelle2021
 
   docker tag ... latest
   docker push makarius/isabelle:latest
 
   https://hub.docker.com/r/makarius/isabelle
   https://docs.docker.com/engine/reference/commandline/push
 
 
 Post-release
 ============
 
+- update Admin/Release/official
+
 - update /home/isabelle and /home/isabelle/html-data
diff --git a/Admin/Release/official b/Admin/Release/official
new file mode 100644
--- /dev/null
+++ b/Admin/Release/official
@@ -0,0 +1,11 @@
+Isabelle2021
+Isabelle2020
+Isabelle2019
+Isabelle2018
+Isabelle2017
+Isabelle2016-1
+Isabelle2016
+Isabelle2015
+Isabelle2014
+Isabelle2013-2
+Isabelle2013