diff --git a/mkdocs.yml b/mkdocs.yml
index 1c70d853c8..281ff9ca16 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -39,7 +39,11 @@ markdown_extensions:
   - mdx_breakless_lists
   - pymdownx.tabbed:
       alternate_style: true
-  - pymdownx.superfences
+  - pymdownx.superfences:
+      custom_fences:
+        - name: mermaid
+          class: mermaid
+          format: !!python/name:pymdownx.superfences.fence_code_format
   - pymdownx.details
   - pymdownx.snippets
   - pymdownx.emoji: