diff --git a/pkgs/applications/virtualization/xen/README.md b/pkgs/applications/virtualization/xen/README.md
index c059808dcecb..9468bb8d148c 100644
--- a/pkgs/applications/virtualization/xen/README.md
+++ b/pkgs/applications/virtualization/xen/README.md
@@ -26,6 +26,7 @@ Some other notable packages that compose the Xen Ecosystem include:
 - `ocamlPackages.xenstore-tool`: XAPI's `oxenstore` utilities.
 - `xen-guest-agent`: Guest drivers for UNIX domUs.
 - `win-pvdrivers`: Guest drivers for Windows domUs.
+- `xtf`: The Xen Test Framework.
 
 ## Updating
 
@@ -99,6 +100,8 @@ open a PR fixing the script, and update Xen manually:
    ```
 
    Change the value of `xenToEvaluate` to evaluate all relevant Xen packages.
+1. Run `xtf --all --host` as root when booted into the Xen update, and make
+   sure no tests fail.
 1. Clean up your changes and commit them, making sure to follow the
    [Nixpkgs Contribution Guidelines](../../../../CONTRIBUTING.md).
 1. Open a PR and await a review from the current maintainers.