diff --git a/doc/design/DecoderRefactor.puml b/doc/design/DecoderRefactor.puml
new file mode 100644
index 000000000..910e16758
--- /dev/null
+++ b/doc/design/DecoderRefactor.puml
@@ -0,0 +1,14 @@
+@startuml
+
+interface IProtocol {
+    encode()
+    decode()
+}
+interface IDecoder
+interface IEncoder
+interface IDecode
+
+class FT8
+IProtocol <|-- FT8
+
+@enduml