diff --git a/Upgrade-from-a-previous-version.md b/Upgrade-from-a-previous-version.md
index 33c7b02..03e346b 100644
--- a/Upgrade-from-a-previous-version.md
+++ b/Upgrade-from-a-previous-version.md
@@ -31,4 +31,11 @@ The configuration option `cookie_key` has been added. To upgrade:
 1. Upgrade Nextcloud.
 2. Remove new apps installed by Nextcloud, only keep the four apps we use: Forms, AppOrder, Custom CSS and Theming.
 3. There are new CSS rules for this version (to cover new Nextcloud Forms features), you need to update your custom CSS rules according to the [setup guide](https://git.42l.fr/neil/sncf/wiki/Setting-up-Nextcloud-and-sncf).
+4. Upgrade and test sncf.
+
+#### From 21.x to 22.x
+
+1. Upgrade Nextcloud.
+2. Remove all apps except Forms, Custom CSS and Theming. (Remove Circles.)
+3. Update the [CSS rules](https://git.42l.fr/neil/sncf/wiki/Setting-up-Nextcloud-and-sncf)
 4. Upgrade and test sncf.
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