diff --git a/pymodm/base/models.py b/pymodm/base/models.py
index be9064f..6a7a092 100644
--- a/pymodm/base/models.py
+++ b/pymodm/base/models.py
@@ -290,6 +290,8 @@ def from_document(cls, document):
     def to_son(self):
         """Get this Model back as a :class:`~bson.son.SON` object.
 
+        It does not dereference fields.
+
         :returns: SON representing this object as a MongoDB document.
 
         """