diff --git a/layouts/_default/_markup/render-codeblock-mermaid.html b/layouts/_default/_markup/render-codeblock-mermaid.html
new file mode 100644
index 0000000..924a441
--- /dev/null
+++ b/layouts/_default/_markup/render-codeblock-mermaid.html
@@ -0,0 +1,4 @@
+<pre class="mermaid">
+{{- .Inner | safeHTML -}}
+</pre>
+{{ .Page.Store.Set "hasMermaid" true }}