diff --git a/app/views/book/settings.py b/app/views/book/settings.py
index 9dd49f0..488814e 100644
--- a/app/views/book/settings.py
+++ b/app/views/book/settings.py
@@ -51,6 +51,10 @@ def add_contributor(book_id: int):
     form = f.AddContributorForm()
     selected_tab = "user_permissions"
     if form.validate_on_submit():
+        user_id = form.user_id.data
+        # notifications
+        contributor_notification(m.Notification.Actions.CONTRIBUTING, book_id, user_id)
+        # -------------
         response = add_contributor_to_book(form, book_id, selected_tab)
         return response
     else:
@@ -77,6 +81,10 @@ def delete_contributor(book_id: int):
     selected_tab = "user_permissions"
 
     if form.validate_on_submit():
+        user_id = form.user_id.data
+        # notifications
+        contributor_notification(m.Notification.Actions.DELETE, book_id, user_id)
+        # -------------
         response = delete_contributor_from_book(form, book_id, selected_tab)
         return response
     else:
diff --git a/migrations/versions/ad0ed27f417f_entity_id.py b/migrations/versions/ad0ed27f417f_entity_id.py
index 61011c9..729c6db 100644
--- a/migrations/versions/ad0ed27f417f_entity_id.py
+++ b/migrations/versions/ad0ed27f417f_entity_id.py
@@ -10,23 +10,23 @@ import sqlalchemy as sa
 
 
 # revision identifiers, used by Alembic.
-revision = 'ad0ed27f417f'
-down_revision = '3d45df38ffa9'
+revision = "ad0ed27f417f"
+down_revision = "3d45df38ffa9"
 branch_labels = None
 depends_on = None
 
 
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    with op.batch_alter_table('notifications', schema=None) as batch_op:
-        batch_op.add_column(sa.Column('entity_id', sa.Integer(), nullable=False))
+    with op.batch_alter_table("notifications", schema=None) as batch_op:
+        batch_op.add_column(sa.Column("entity_id", sa.Integer(), nullable=False))
 
     # ### end Alembic commands ###
 
 
 def downgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    with op.batch_alter_table('notifications', schema=None) as batch_op:
-        batch_op.drop_column('entity_id')
+    with op.batch_alter_table("notifications", schema=None) as batch_op:
+        batch_op.drop_column("entity_id")
 
     # ### end Alembic commands ###