diff --git a/samples/demo01.md b/samples/demo01.md
index bb61718..7e64908 100644
--- a/samples/demo01.md
+++ b/samples/demo01.md
@@ -9,6 +9,16 @@ export_on_save:
 
 [TOC]
 
+# Plantuml
+
+```plantuml
+    Alice -> Bob: Authentication Request
+    Bob --> Alice: Authentication Response
+
+    Alice -> Bob: Another authentication Request
+    Alice <-- Bob: Another authentication Response
+```
+
 # 时序图
 
 ```plantuml
@@ -185,4 +195,4 @@ mindmapDiagram {
 --- test
 -- test2
 @endmindmap
-```
\ No newline at end of file
+```