diff --git a/src/sa/model/context.puml b/src/sa/model/context.puml
new file mode 100644
index 0000000..111950a
--- /dev/null
+++ b/src/sa/model/context.puml
@@ -0,0 +1,28 @@
+@startuml
+!include <C4/C4_Container>
+
+Person(user_s, "User", "")
+Person(user_p, "System administrator", "could be also power user/tinkerer")
+
+System_Boundary(boundary, "SmartHut") {
+
+}
+
+System_Ext(smartdevice, "Smart Device")
+
+System_Ext(sensor, "Smart Sensor")
+
+Rel(user_s, boundary, "Controls smart devices")
+Rel(boundary, user_s, "Informs of device status")
+
+Rel(user_p, boundary, "Installs and maintains")
+Rel(boundary, user_p, "Reports performance metrics")
+
+
+Rel(boundary, smartdevice, "Checks if alive")
+Rel(boundary, smartdevice, "Controls", "device state, settings")
+Rel(smartdevice, boundary, "Transmits state")
+
+Rel(boundary, sensor, "Checks if alive")
+Rel(sensor, boundary, "Transmits measurements", "temperature, light, humidity")
+@enduml
\ No newline at end of file
diff --git a/src/sa/model/index.md b/src/sa/model/index.md
index f7f5b89..13875fb 100644
--- a/src/sa/model/index.md
+++ b/src/sa/model/index.md
@@ -443,8 +443,6 @@ Here is a list of features included in the existing application. All other featu
       - x66-64 linux
     - docker-compose script
       - v2.4
-  
-
 
 ![Feature Model Diagram](./features.fml1)
 
@@ -468,7 +466,7 @@ Exceed: >1 User and >1 Dependency, with both incoming and outgoing dependencies
 
 }
 
-
+![Context Diagram](./context.puml)
 
 
 # Ex - Component Model: Top-Down