diff --git a/modules/release_guide/pages/sop_mass_rebuild_packages.adoc b/modules/release_guide/pages/sop_mass_rebuild_packages.adoc
index 5084ef9..606a906 100644
--- a/modules/release_guide/pages/sop_mass_rebuild_packages.adoc
+++ b/modules/release_guide/pages/sop_mass_rebuild_packages.adoc
@@ -230,6 +230,33 @@ Set up the Site for Packages that Need Rebuilt::
 $ while true; do ./need-rebuild.py > f26-need-rebuild.html && cp f26-need-rebuild.html /mnt/koji/mass-rebuild/f26-need-rebuild.html; sleep 600; done
 ....
 
+==== Testing the Mass Rebuild
+
+Fedora openQA's update test suite can be run on the mass rebuild tag
+before it is merged, to find any major bugs it may cause. The command
+to trigger tests is `fedora-openqa tag <tagname> <release number>`,
+e.g. `fedora-openqa tag f39-rebuild 39`. This can be run as root
+directly on an openQA server (preferably the staging instance), or
+from any system with an appropriate configuration in
+`~/.config/openqa/client.conf`, as documented https://pagure.io/fedora-qa/fedora_openqa[here].
+The link to the results will appear as the first entry under Fedora
+Updates on the front page of the web UI (at time of creation, any
+updates that appear subsequently will go top of the list) with a name
+like "BuildTAG_f39-rebuild". On the results page you see when clicking
+this, green dots indicate passed tests, red dots indicate failed tests,
+yellow dots indicate 'softfailed' tests (these are probably fine), and
+blue dots indicate scheduled/running tests. Grey dots indicate a test
+that was cancelled (probably because a parent or sibling test failed).
+If you see all green (or green and yellow), things are good. All green/
+yellow and blue, wait for the blues to change color. Any red or grey,
+call for help from a QA person to interpret the results (and don't
+merge anything yet).
+
+Contact an openQA admin (look for the tall, dashingly good-looking ones
+in https://matrix.to/#/#quality:fedoraproject.org[Fedora Quality chat])
+for help scheduling the tests and interpreting the results if you are
+unsure.
+
 ==== Post Mass Rebuild Tasks
 
 Once the mass rebuild script completes, and all the pending builds have