diff --git a/internal/domain/list.go b/internal/domain/list.go
index c603377..59f5d36 100644
--- a/internal/domain/list.go
+++ b/internal/domain/list.go
@@ -39,7 +39,7 @@ func NewListService(r ListRepository) *ListService {
 	return &ListService{repo: r}
 }
 
-func (s *ListService) Create(ctx context.Context, name string, userIDs []string) (*List, error) {
+func (s *ListService) Create(ctx context.Context, authUserID string, name string, userIDs []string) (*List, error) {
 	if len(userIDs) == 0 {
 		return nil, errors.New("users must have at least one associated user")
 	}
@@ -51,7 +51,7 @@ func (s *ListService) Create(ctx context.Context, name string, userIDs []string)
 	return s.repo.CreateList(ctx, name, userIDs)
 }
 
-func (s *ListService) AddUserToList(ctx context.Context, ownerID string, listID string, userID string) error {
+func (s *ListService) AddUserToList(ctx context.Context, authUserID string, listID string, userID string) error {
 	if listID == "" {
 		return errors.New("list id must not be empty")
 	}
@@ -62,7 +62,7 @@ func (s *ListService) AddUserToList(ctx context.Context, ownerID string, listID
 	return s.repo.AddUserToList(ctx, listID, userID)
 }
 
-func (s *ListService) RemoveUserFromList(ctx context.Context, ownerID string, listID string, userID string) error {
+func (s *ListService) RemoveUserFromList(ctx context.Context, authUserID string, listID string, userID string) error {
 	if listID == "" {
 		return errors.New("list id must not be empty")
 	}
@@ -73,7 +73,7 @@ func (s *ListService) RemoveUserFromList(ctx context.Context, ownerID string, li
 	return s.repo.RemoveUserFromList(ctx, listID, userID)
 }
 
-func (s *ListService) CreateListItem(ctx context.Context, ownerID string, listID string, title string) (*ListItem, error) {
+func (s *ListService) CreateListItem(ctx context.Context, authUserID string, listID string, title string) (*ListItem, error) {
 	if listID == "" {
 		return nil, errors.New("list id must not be empty")
 	}
@@ -84,7 +84,7 @@ func (s *ListService) CreateListItem(ctx context.Context, ownerID string, listID
 	return s.repo.CreateListItem(ctx, listID, title)
 }
 
-func (s *ListService) UpdateListItem(ctx context.Context, ownerID string, listItemID string, title string, isCompleted bool) error {
+func (s *ListService) UpdateListItem(ctx context.Context, authUserID string, listItemID string, title string, isCompleted bool) error {
 	if listItemID == "" {
 		return errors.New("list item id must not be empty")
 	}