stages/deny: add deny stage

website/docs/releases/2021.3.md

@@ -1,5 +1,5 @@
 ---
-title: Next release
+title: Release 2021.1.3
 ---
 
 ## Headline Changes
@@ -32,6 +32,13 @@ title: Next release
 
     It also allows other services to use the flow executor via an API, which will be used by the outpost further down the road.
 
+- Deny stage
+
+    A new stage which simply denies access. This can be used to conditionally deny access to users during a flow. Authorization flows for example required an authenticated user, but there was no previous way to block access for un-authenticated users.
+
+    If you conditionally include this stage in a flow, make sure to disable "Evaluate on plan", as that will always include the stage in the flow, irregardless of the inputs.
+
+
 ## Upgrading
 
 This release does not introduce any new requirements.