diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 116e0ec..d7042fc 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -21354,6 +21354,7 @@ Besides destructors and deallocation functions, common error-safety techniques r
     T& T::operator=(const T& other) {
         auto temp = other;
         swap(temp);
+        return *this;
     }
 
 (See also Item 56. ???)