diff --git a/domain/framework/entity.py b/domain/framework/entity.py
index 99f0ad9..9dc8850 100644
--- a/domain/framework/entity.py
+++ b/domain/framework/entity.py
@@ -17,5 +17,8 @@ class Entity(ABC):
     def _ensure_valid_state(self):
         pass
 
+    def when(self, event: DomainEvent) -> Self:
+        return self
+
     def clear_changes(self) -> Self:
         return replace(self, _changes=())