diff --git a/doc/rtd/content/99_appendices/appendix2/sub/pool/mlpro_bf/bf_systems/images/MLPro-BF-Systems-PT1_PT2_System_class_diagram.drawio b/doc/rtd/content/99_appendices/appendix2/sub/pool/mlpro_bf/bf_systems/images/MLPro-BF-Systems-PT1_PT2_System_class_diagram.drawio
new file mode 100644
index 000000000..176834c0b
--- /dev/null
+++ b/doc/rtd/content/99_appendices/appendix2/sub/pool/mlpro_bf/bf_systems/images/MLPro-BF-Systems-PT1_PT2_System_class_diagram.drawio
@@ -0,0 +1,116 @@
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