diff --git a/internal/api/handler/list.go b/internal/api/handler/list.go
index 179b164..7354a07 100644
--- a/internal/api/handler/list.go
+++ b/internal/api/handler/list.go
@@ -3,7 +3,6 @@ package handler
 import (
 	"log/slog"
 	"net/http"
-	"slices"
 
 	"github.com/robindittmar/dttmr-api/internal/api/request"
 	"github.com/robindittmar/dttmr-api/internal/api/response"
@@ -47,12 +46,7 @@ func (h *ListHandler) CreateList(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// TODO: should this be in ListService?
-	if !slices.Contains(payload.UserIDs, authContext.UserID) {
-		payload.UserIDs = append(payload.UserIDs, authContext.UserID)
-	}
-
-	list, err := h.ListService.Create(ctx, payload.Name, payload.UserIDs)
+	list, err := h.ListService.Create(ctx, authContext.UserID, payload.Name, payload.UserIDs)
 	if err != nil {
 		slog.ErrorContext(ctx, "failed to create list", slog.Any("error", err))
 		response.Error(ctx, w, http.StatusInternalServerError, "failed to create list")
diff --git a/internal/domain/list.go b/internal/domain/list.go
index 59f5d36..c3275d1 100644
--- a/internal/domain/list.go
+++ b/internal/domain/list.go
@@ -3,6 +3,7 @@ package domain
 import (
 	"context"
 	"errors"
+	"slices"
 	"time"
 )
 
@@ -48,6 +49,10 @@ func (s *ListService) Create(ctx context.Context, authUserID string, name string
 		return nil, errors.New("list name must not be empty")
 	}
 
+	if !slices.Contains(userIDs, authUserID) {
+		userIDs = append(userIDs, authUserID)
+	}
+
 	return s.repo.CreateList(ctx, name, userIDs)
 }