diff --git a/basic_content/virtual/set4/warn_rtti.cpp b/basic_content/virtual/set4/warn_rtti.cpp
index 4e027ab..475ef9a 100644
--- a/basic_content/virtual/set4/warn_rtti.cpp
+++ b/basic_content/virtual/set4/warn_rtti.cpp
@@ -22,4 +22,4 @@ class E : private A {};
 
 // F为多态类型
 
-class F : private B {}
+class F : private B {};