diff --git a/layouts/shortcodes/mermaid.html b/layouts/shortcodes/mermaid.html
index 3ce5e2a..b57a404 100644
--- a/layouts/shortcodes/mermaid.html
+++ b/layouts/shortcodes/mermaid.html
@@ -3,7 +3,7 @@
 {{ $data := dict "code" .Inner "mermaid" $mermaidData }}
 
 <figure class="mermaid">
-  <img src="https://mermaid.ink/img/{{ $data | jsonify | base64Encode }}" referrerpolicy="no-referrer" decoding="async" loading="lazy" />
+  <img src="https://mermaid.ink/img/{{ $data | jsonify | base64Encode }}" referrerpolicy="no-referrer" decoding="async" loading="lazy" alt='{{ .Get "caption" }}' />
   <figcaption class="text-center">
     <small>{{ .Get "caption" }}</small>
   </figcaption>