diff --git a/README.md b/README.md
index 8a699da..725b10d 100644
--- a/README.md
+++ b/README.md
@@ -8,18 +8,6 @@ Web server for WebDAV resources
 
 ## Architecture
 
-```staruml
-@startuml
+### File streaming
 
-actor Client
-actor Pathfinder
-actor Sentinel
-actor Fileye
-
-Client -> Pathfinder
-Pathfinder -> Sentinel : Check authorization
-Sentinel -> Pathfinder : Return session info
-Pathfinder -> Fileye : Stream content
-
-@enduml
-```
+<img src="https://code.ita-prog.pl/Tsumanu/puffball/raw/branch/master/assets/stream.svg">
diff --git a/assets/stream.puml b/assets/stream.puml
new file mode 100644
index 0000000..a691133
--- /dev/null
+++ b/assets/stream.puml
@@ -0,0 +1,16 @@
+@startuml
+
+Client -> Pathfinder
+Pathfinder -> Sentinel : Check authorization
+
+Sentinel -> LoggedState : Logged
+alt User Authorized
+  Sentinel -> Pathfinder : Authorized
+  Pathfinder -> Fileye : Open stream
+  Fileye -> Client : Resource access
+else Unauthenticated
+  Sentinel -> Pathfinder : Unauthenticated
+  Pathfinder -> Client : Unauthenticated
+end
+
+@enduml
diff --git a/assets/stream.svg b/assets/stream.svg
new file mode 100644
index 0000000..7a921ff
--- /dev/null
+++ b/assets/stream.svg
@@ -0,0 +1 @@
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