docs: add link to original project (#11)

ComPWA · Apr 6, 2021 · 34225a3 · 34225a3
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diff --git a/docs/index.md b/docs/index.md
@@ -16,6 +16,13 @@ For an overview of upcoming releases and planned functionality, see
 ```
 ````
 
+:::{dropdown} Original project: PWA Expert System
+
+The original project was the {doc}`expertsystem:index`. AmpForm originates from
+its {mod}`~expertsystem.amplitude` module.
+
+:::
+
 ## Table of Contents
 
 ```{toctree}