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+This docker images is used for testing Chrome, Firefox, WebKitGTK and running
+other tasks on Taskcluster. When any of the files in this directory change, the
+images must be updated as well. Doing this requires you be part of the
+'webplatformtests' organization on Docker Hub; ping @foolip or @jpchase
+if you are not a member.
+
+The tag for a new docker image is of the form
+`webplatformtests/wpt:{current-version + 0.01}`
+
+To update the docker image:
+
+* Update the following Taskcluster configurations to use the new image:
+ - `.taskcluster.yml` (the decision task)
+ - `tools/ci/tc/tasks/test.yml` (all the other tasks)
+
+* Run `wpt docker-push`