diff --git a/ereuse_devicehub/migrations/versions/378b6b147b46_nullable.py b/ereuse_devicehub/migrations/versions/378b6b147b46_nullable.py
index 670749f7..4bc48443 100644
--- a/ereuse_devicehub/migrations/versions/378b6b147b46_nullable.py
+++ b/ereuse_devicehub/migrations/versions/378b6b147b46_nullable.py
@@ -31,6 +31,9 @@ def upgrade():
     op.alter_column('display', 'size', nullable=True, schema=f'{get_inv()}')
     op.alter_column('display', 'resolution_width', nullable=True, schema=f'{get_inv()}')
     op.alter_column('display', 'resolution_height', nullable=True, schema=f'{get_inv()}')
+    op.alter_column('monitor', 'size', nullable=True, schema=f'{get_inv()}')
+    op.alter_column('monitor', 'resolution_width', nullable=True, schema=f'{get_inv()}')
+    op.alter_column('monitor', 'resolution_height', nullable=True, schema=f'{get_inv()}')
     # pass
 
 
diff --git a/ereuse_devicehub/resources/device/schemas.py b/ereuse_devicehub/resources/device/schemas.py
index c05199f0..ea5b3211 100644
--- a/ereuse_devicehub/resources/device/schemas.py
+++ b/ereuse_devicehub/resources/device/schemas.py
@@ -148,17 +148,17 @@ class Server(Computer):
 
 class DisplayMixin:
     __doc__ = m.DisplayMixin.__doc__
-    size = Float(description=m.DisplayMixin.size.comment, validate=Range(2, 150), required=True)
+    size = Float(description=m.DisplayMixin.size.comment, validate=Range(2, 150))
     technology = EnumField(enums.DisplayTech,
                            description=m.DisplayMixin.technology.comment)
     resolution_width = Integer(data_key='resolutionWidth',
                                validate=Range(10, 20000),
                                description=m.DisplayMixin.resolution_width.comment,
-                               required=True)
+                               )
     resolution_height = Integer(data_key='resolutionHeight',
                                 validate=Range(10, 20000),
                                 description=m.DisplayMixin.resolution_height.comment,
-                                required=True)
+                                )
     refresh_rate = Integer(data_key='refreshRate', validate=Range(10, 1000))
     contrast_ratio = Integer(data_key='contrastRatio', validate=Range(100, 100000))
     touchable = Boolean(description=m.DisplayMixin.touchable.comment)