diff --git a/src/fiber_package/entity/person.py b/src/fiber_package/entity/person.py
index f69ebeb..39e72a2 100644
--- a/src/fiber_package/entity/person.py
+++ b/src/fiber_package/entity/person.py
@@ -45,6 +45,7 @@ class PersonModel(FiberBaseModel):
         self.full_name = full_name
         return self
 
+    # Needed for dates, as pymongo cannot handle them
     @field_serializer("date_of_birth", when_used="always")
     def serialize_date(self, value: date | None):
         return value.isoformat() if value else None
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