diff --git a/src/services/export/single.spec.ts b/src/services/export/single.spec.ts
new file mode 100644
index 000000000..cf9d391fc
--- /dev/null
+++ b/src/services/export/single.spec.ts
@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+import BNote from "../../becca/entities/bnote.js";
+import { mapByNoteType } from "./single.js";
+
+describe("Note type mappings", () => {
+    it("supports mermaid note", () => {
+        const note = new BNote({
+            type: "mermaid",
+            title: "New note"
+        });
+
+        expect(mapByNoteType(note, "", "html")).toMatchObject({
+            extension: "mermaid",
+            mime: "text/vnd.mermaid"
+        });
+    });
+});
diff --git a/src/services/export/single.ts b/src/services/export/single.ts
index 18ea83036..b626bf919 100644
--- a/src/services/export/single.ts
+++ b/src/services/export/single.ts
@@ -65,6 +65,10 @@ export function mapByNoteType(note: BNote, content: string | Buffer<ArrayBufferL
         payload = content;
         extension = "excalidraw";
         mime = "application/json";
+    } else if (note.type === "mermaid") {
+        payload = content;
+        extension = "mermaid";
+        mime = "text/vnd.mermaid";
     } else if (note.type === "relationMap" || note.type === "search") {
         payload = content;
         extension = "json";