diff --git a/_config.yml b/_config.yml
index c582a146..143591d2 100644
--- a/_config.yml
+++ b/_config.yml
@@ -6,6 +6,7 @@ theme: jekyll-theme-slate
 markdown: kramdown
 plugins:
   - jekyll-graphviz
+  - jekyll-mermaid
 kramdown:
   input: GFM
   syntax_highlighter: rouge