diff --git a/schemas.ts b/schemas.ts
index 9393db0..e5f8e46 100644
--- a/schemas.ts
+++ b/schemas.ts
@@ -549,13 +549,13 @@ export const GitLabDiscussionNoteSchema = z.object({
         .object({
           start: z.object({
             line_code: z.string(),
-            type: z.enum(["new", "old", "expanded"]),
+            type: z.enum(["new", "old", "expanded"]).optional(),
             old_line: z.number().nullable(),
             new_line: z.number().nullable(),
           }),
           end: z.object({
             line_code: z.string(),
-            type: z.enum(["new", "old", "expanded"]),
+            type: z.enum(["new", "old", "expanded"]).optional(),
             old_line: z.number().nullable(),
             new_line: z.number().nullable(),
           }),