diff --git a/app/src/protyle/markdown/mermaidRender.ts b/app/src/protyle/markdown/mermaidRender.ts
index 074fb3905..1cfe19071 100644
--- a/app/src/protyle/markdown/mermaidRender.ts
+++ b/app/src/protyle/markdown/mermaidRender.ts
@@ -32,7 +32,8 @@ export const mermaidRender = (element: Element, cdn = Constants.PROTYLE_CDN) =>
                 useMaxWidth: true,
                 diagramMarginX: 8,
                 diagramMarginY: 8,
-                boxMargin: 8
+                boxMargin: 8,
+                showSequenceNumbers: true // https://mermaid.js.org/syntax/sequenceDiagram.html#sequencenumbers
             },
             gantt: {
                 leftPadding: 75,