diff --git a/site/content/docs/_index.md b/site/content/docs/_index.md
index 7dec4dea..faa092cb 100644
--- a/site/content/docs/_index.md
+++ b/site/content/docs/_index.md
@@ -36,7 +36,7 @@ distributions to make authentication possible.
 
 To learn more, see [docs/architecture](/docs/architecture).
 
-<img src="docs/img/pinniped_architecture.svg" alt="Pinniped Architecture Sketch" width="300px"/>
+<img src="docs/img/pinniped_architecture_concierge_supervisor.svg" alt="Pinniped Architecture Sketch" width="300px"/>
 
 ## Trying Pinniped
 
diff --git a/site/content/docs/img/README.md b/site/content/docs/img/README.md
index 6383c42e..8f8b187d 100644
--- a/site/content/docs/img/README.md
+++ b/site/content/docs/img/README.md
@@ -12,7 +12,13 @@
   image, run `plantuml -tsvg pinniped.txt` from this directory, or go to
   https://www.planttext.com/.
 
-- [pinniped_architecture.svg](pinniped_architecture.svg) was created on [draw.io](https://draw.io).
+- [pinniped_architecture_concierge_supervisor.svg](pinniped_architecture_concierge_supervisor.svg) was created on [draw.io](https://draw.io).
+  It can be opened again for editing on that site by choosing "File" -> "Open from" -> "Device".
+  Because it includes embedded icons it should be exported using "File" -> "Export as" -> "SVG",
+  with the "Transparent Background", "Embed Images", and "Include a copy of my diagram" options
+  checked. The icons in this diagram are from their "CAE" shapes set.
+
+- [pinniped_architecture_concierge_webhook.svg](pinniped_architecture_concierge_webhook.svg) was created on [draw.io](https://draw.io).
   It can be opened again for editing on that site by choosing "File" -> "Open from" -> "Device".
   Because it includes embedded icons it should be exported using "File" -> "Export as" -> "SVG",
   with the "Transparent Background", "Embed Images", and "Include a copy of my diagram" options