diff --git a/aur-dev.archlinux.org-Testing.md b/aur-dev.archlinux.org-Testing.md
index e1691c7..ec4c43e 100644
--- a/aur-dev.archlinux.org-Testing.md
+++ b/aur-dev.archlinux.org-Testing.md
@@ -29,6 +29,8 @@ Or set the `aurweb_version` cookie to a valid choice any other way.
 To check which choice you're currently on, visit
 https://aur-dev.archlinux.org/version, which displays your current choice.
 
+Additionally, when `aurweb_version` is set to `fastapi`, a `HEAD@<short_commit_hash>` link will be shown in aurweb's footer, next to the release version. If this link appears in the footer, you're on `fastapi`.
+
 ## Data
 
 The majority of data that can be found on the aur-dev instance is