docs/8.0/ayanova/docs/ay-extensions.md

@@ -56,3 +56,11 @@ Extensions run as a [Job](ops-jobs.md) at the server, so when you start an exten
 When the server reaches the extension job in the queue it will submit that job to the individual business object handler to be processed and will return the results when completed.
 
 The extension control will keep rechecking with the server until it's signalled that the job is completed or failed and will display a status notification.
+
+### Progress
+
+While an extension is running it will display the progress if appropriate and offer a cancel button to request the server stop the job in progress.
+
+![extension progress](img/ay-extension-progress.png)
+
+Cancelling a job does not reverse the changes already made to that point, it only stops the job from processing the remaining records.