diff --git a/README.md b/README.md
index 30d9fa8..1d6c93e 100644
--- a/README.md
+++ b/README.md
@@ -50,4 +50,19 @@ X^2^
 - Third
 
 - [ ] First
-- [x] Second
\ No newline at end of file
+- [x] Second
+
+## Diagram
+
+```mermaid
+sequenceDiagram
+    participant dotcom
+    participant iframe
+    participant viewscreen
+    dotcom->>iframe: loads html w/ iframe url
+    iframe->>viewscreen: request template
+    viewscreen->>iframe: html & javascript
+    iframe->>dotcom: iframe ready
+    dotcom->>iframe: set mermaid data on iframe
+    iframe->>iframe: render mermaid
+```