[GitHub] [airflow] ashb commented on a change in pull request #5787: [AIRFLOW-5172] Add choice of interval edge scheduling

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ashb commented on a change in pull request #5787: [AIRFLOW-5172] Add choice of interval edge scheduling
URL: https://github.com/apache/airflow/pull/5787#discussion_r314810033
 
 

 ##########
 File path: docs/scheduler.rst
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 @@ -94,6 +94,75 @@ should be triggered and come to a crawl. It might also create undesired
 processing when changing the shape of your DAG, by say adding in new
 tasks.
 
+Scheduled Time vs Execution Time
+''''''''''''''''''''''''''''''''
+
+A DAG with a ``schedule_interval`` will execute once per interval. By
+default, the execution of a DAG will occur at the **end** of the
+schedule interval.
+
+A few examples:
+
+- A DAG with ``schedule_interval='@hourly'``: The DAG run that processes
+  2019-08-16 17:00 will start running at 2019-08-16 18:00.
 
 Review comment:
   ```suggestion
     2019-08-16 17:00 will start running just after 2019-08-16 17:59:59 -- i.e. once that hour is over.
   ```

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