diff --git a/README.md b/README.md
index 9b592e0e..78d56afe 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,10 @@ python scripts/generate_analysis_config.py
 ```
 `analyse` executes the analysis and optional plug-ins. `plot` renders figures using the produced ROOT file.
 
+## Plotting workflow
+
+The plotting stages are outlined in [docs/plot_activity_diagram.puml](docs/plot_activity_diagram.puml).
+
 ## Plug-in architecture
 See [docs/plugin_class_diagram.puml](docs/plugin_class_diagram.puml) for the relationships between plug-in interfaces, managers, and example implementations.
 
diff --git a/docs/plot_activity_diagram.puml b/docs/plot_activity_diagram.puml
new file mode 100644
index 00000000..20f45fd3
--- /dev/null
+++ b/docs/plot_activity_diagram.puml
@@ -0,0 +1,13 @@
+@startuml
+start
+
+:Load configs and result file;
+
+:Construct AnalysisDataLoader objects;
+
+:Invoke PlotPluginManager;
+
+:Run plugins;
+
+stop
+@enduml