diff --git a/docarray/documents/text.py b/docarray/documents/text.py
index 0e3edbbcec2..98a335fb268 100644
--- a/docarray/documents/text.py
+++ b/docarray/documents/text.py
@@ -43,6 +43,7 @@ class TextDoc(BaseDocument):
         from docarray.typing import AnyEmbedding
         from typing import Optional
 
+
         # extend it
         class MyText(Text):
             second_embedding: Optional[AnyEmbedding]
@@ -62,6 +63,7 @@ class MyText(Text):
         from docarray import BaseDocument
         from docarray.documents import ImageDoc, TextDoc
 
+
         # compose it
         class MultiModalDoc(BaseDocument):
             image_doc: Image
@@ -96,10 +98,10 @@ class MultiModalDoc(BaseDocument):
         doc == doc2  # False, their ids are not equivalent
     """
 
-    text: Optional[str] = None
-    url: Optional[TextUrl] = None
-    embedding: Optional[AnyEmbedding] = None
-    bytes: Optional[bytes] = None
+    text: Optional[str]
+    url: Optional[TextUrl]
+    embedding: Optional[AnyEmbedding]
+    bytes: Optional[bytes]
 
     def __init__(self, text: Optional[str] = None, **kwargs):
         if 'text' not in kwargs:
diff --git a/docarray/documents/video.py b/docarray/documents/video.py
index debd93e3540..407d966fb3c 100644
--- a/docarray/documents/video.py
+++ b/docarray/documents/video.py
@@ -102,7 +102,7 @@ class MultiModalDoc(BaseDocument):
     tensor: Optional[VideoTensor]
     key_frame_indices: Optional[AnyTensor]
     embedding: Optional[AnyEmbedding]
-    bytes: Optional[bytes] = None
+    bytes: Optional[bytes]
 
     @classmethod
     def validate(