sjwiesman commented on a change in pull request #12559:
URL: https://github.com/apache/flink/pull/12559#discussion_r437646932
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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.
Review comment:
```suggestion
occurred is important.
```
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