diff --git a/basic_content/virtual/set4/warn_rtti.cpp b/basic_content/virtual/set4/warn_rtti.cpp
index bdc193e..986879d 100644
--- a/basic_content/virtual/set4/warn_rtti.cpp
+++ b/basic_content/virtual/set4/warn_rtti.cpp
@@ -14,7 +14,7 @@ class B{
 
 };
 
-//D为多态类型
+//D为非多态类型
 
 class D: public A{