diff --git a/migrations/versions/cb2ea87be0bd_document_comments.py b/migrations/versions/cb2ea87be0bd_document_comments.py
new file mode 100644
index 0000000..61ba5d7
--- /dev/null
+++ b/migrations/versions/cb2ea87be0bd_document_comments.py
@@ -0,0 +1,45 @@
+"""document comments
+
+Revision ID: cb2ea87be0bd
+Revises: 2a02384ab925
+Create Date: 2024-12-15 01:24:30.954923
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = 'cb2ea87be0bd'
+down_revision: Union[str, None] = '2a02384ab925'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('document_comments',
+    sa.Column('id', sa.UUID(), nullable=False),
+    sa.Column('doc_id', sa.UUID(), nullable=True),
+    sa.Column('author_id', sa.String(), nullable=False),
+    sa.Column('comment', sa.Text(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('NOW()'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.text('NOW()'), nullable=False),
+    sa.ForeignKeyConstraint(['author_id'], ['users.id'], ),
+    sa.ForeignKeyConstraint(['doc_id'], ['document_metadata.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_document_comments_id'), 'document_comments', ['id'], unique=False)
+    op.drop_index('ix_notify_id', table_name='notify')
+    op.create_unique_constraint(None, 'share_url', ['url_id'])
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'share_url', type_='unique')
+    op.drop_index(op.f('ix_document_comments_id'), table_name='document_comments')
+    op.drop_table('document_comments')
+    # ### end Alembic commands ###