sjwiesman commented on a change in pull request #12559:
URL: https://github.com/apache/flink/pull/12559#discussion_r437646613
##########
File path: docs/concepts/timely-stream-processing.md
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@@ -24,17 +24,25 @@ specific language governing permissions and limitations
under the License.
-->
-`TODO: add introduction`
-
* This will be replaced by the TOC
{:toc}
+## Introduction
+
+Timely steam processing is an extension of [stateful stream processing]({% link
+concepts/stateful-stream-processing.md %}) in which time plays some role in the
+computation. Among other things, this is the case when you do time series
+analysis, when doing aggregations based on certain time periods (typically
+called windows), or when you do event processing where the time when an event
+occured is important.
+
+In the following sections we will highlight some of the topics that you should
+consider when working with timely Flink Applications.
+
Review comment:
Putting the toc after the intro is more consistent with the rest of the
docs.
```suggestion
Timely steam processing is an extension of [stateful stream processing]({%
link
concepts/stateful-stream-processing.md %}) in which time plays some role in
the
computation. Among other things, this is the case when you do time series
analysis, when doing aggregations based on certain time periods (typically
called windows), or when you do event processing where the time when an event
occurred is important.
In the following sections, we will highlight some of the topics that you
should
consider when working with timely Flink Applications.
* This will be replaced by the TOC
{:toc}
```
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