Remove outdated reactive guide and add section about Reactive Streams to flow.md
diff --git a/docs/flow.md b/docs/flow.md
index 2a3ffb5..7837a54 100644
--- a/docs/flow.md
+++ b/docs/flow.md
@@ -58,6 +58,7 @@
* [Upstream exceptions only](#upstream-exceptions-only)
* [Imperative versus declarative](#imperative-versus-declarative)
* [Launching flow](#launching-flow)
+ * [Flow and Reactive Streams](#flow-and-reactive-streams)
<!--- END_TOC -->
@@ -1794,6 +1795,18 @@
Note that [launchIn] also returns a [Job], which can be used to [cancel][Job.cancel] the corresponding flow collection
coroutine only without cancelling the whole scope or to [join][Job.join] it.
+### Flow and Reactive Streams
+
+For those who are familiar with [Reactive Streams](https://www.reactive-streams.org/) or reactive frameworks such as RxJava and project Reactor,
+design of the Flow may look very familiar.
+
+Indeed, its design was inspired by Reactive Streams and its various implementations. But Flow main goal is to have as simple design as possible,
+be Kotlin and suspension friendly and respect structured concurrency. Achieving this goal would be impossible without reactive pioneers and their tremendous work. You can read the complete story in [Reactive Streams and Kotlin Flows](https://medium.com/@elizarov/reactive-streams-and-kotlin-flows-bfd12772cda4) article.
+
+While being different, conceptually, Flow *is* a reactive stream and it is possible to convert it to the reactive (spec and TCK compliant) Publisher and vice versa.
+Such converters are provided by `kotlinx.coroutines` out-of-the-box and can be found in corresponding reactive modules (`kotlinx-coroutines-reactive` for Reactive Streams, `kotlinx-coroutines-reactor` for Project Reactor and `kotlinx-coroutines-rx2` for RxJava2).
+Integration modules include conversions from and to `Flow`, integration with Reactor's `Context` and suspension-friendly ways to work with various reactive entities.
+
<!-- stdlib references -->
[collections]: https://kotlinlang.org/docs/reference/collections-overview.html