diff --git a/README.md b/README.md
index e215bc4..6afd2ae 100644
--- a/README.md
+++ b/README.md
@@ -34,3 +34,20 @@ You can check out [the Next.js GitHub repository](https://github.com/vercel/next
 The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
 
 Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.
+
+testing mermaid
+
+```mermaid
+graph TD
+    A[Start] --> B{Decision?}
+    B -->|Yes| C[Do something]
+    B -->|No| D[Do something else]
+```
+
+testing plant
+```plantuml
+@startuml
+Alice -> Bob: Hello
+Bob --> Alice: Hi
+@enduml
+```