diff --git a/samples/demo02.md b/samples/demo02.md
index 7d79c83..266bd38 100644
--- a/samples/demo02.md
+++ b/samples/demo02.md
@@ -1,10 +1,8 @@
 ---
 puppeteer:
-  landscape: false
-  format: "A4"
-  timeout: 3000
-export_on_save:
- puppeteer: true
+landscape: false format: "A4"
+timeout: 3000 export_on_save:
+puppeteer: true
 ---
 
 # 时序图
@@ -19,4 +17,22 @@ GitLab -> Tomcat: Hello, my name is GitLab
 Tomcat -> GitLab: Nice to meet you.
 Tomcat <-- GitLab: Nice to meet you too.
 @enduml
- ```
\ No newline at end of file
+ ```
+
+# 引入模块
+
+```plantuml
+@startuml
+!include <C4/C4_Container>
+
+Person(personAlias, "Label", "Optional Description")
+Container(containerAlias, "Label", "Technology", "Optional Description")
+System(systemAlias, "Label", "Optional Description")
+
+System_Ext(extSystemAlias, "Label", "Optional Description")
+
+Rel(personAlias, containerAlias, "Label", "Optional Technology")
+
+Rel_U(systemAlias, extSystemAlias, "Label", "Optional Technology")
+@enduml
+```