diff --git a/2021-03/spring-15-mvc/pom.xml b/2021-03/spring-15-mvc/pom.xml
index 9fe92a9b..c9bb3f66 100644
--- a/2021-03/spring-15-mvc/pom.xml
+++ b/2021-03/spring-15-mvc/pom.xml
@@ -15,6 +15,6 @@
         <module>spring-mvc-solution-1</module>
         <module>spring-mvc-solution-2</module>
         <module>spring-mvc-solution-3</module>
-        <module>spring-mvc-solution-4</module>
+        <module>spring-mvc-demo</module>
     </modules>
 </project>