diff --git a/server-rs/crates/api-server/src/modules/game_distribution_media.rs b/server-rs/crates/api-server/src/modules/game_distribution_media.rs
index 2ed0207ad..756adf81a 100644
--- a/server-rs/crates/api-server/src/modules/game_distribution_media.rs
+++ b/server-rs/crates/api-server/src/modules/game_distribution_media.rs
@@ -175,6 +175,10 @@ async fn read_image_field(
     kind: MediaKind,
 ) -> Result<UploadedImage, AppError> {
     let label = kind.label();
+    // TODO(perf): `Field::bytes()` 会把整个 part 收成一个 `Bytes`，下面 `to_vec()` 再复制一份，
+    // 峰值内存约 2× part；单个超大 part 会被完整缓冲后才在下面判 413。彻底做法是改
+    // `field.chunk()` 循环累加，边收边按 `MAX_SINGLE_MEDIA_BYTES` 拒绝，并让 `UploadedImage.bytes`
+    // 直接持有 `Vec<u8>`。当前保留现状，先在此标注。
     let bytes = field
         .bytes()
         .await