diff --git a/src/core/apis/packet.ts b/src/core/apis/packet.ts
index 114b0d59..7e65f930 100644
--- a/src/core/apis/packet.ts
+++ b/src/core/apis/packet.ts
@@ -111,6 +111,7 @@ export class NTQQPacketApi {
         await this.sendPacket('OidbSvcTrpcTcp.0x8fc_2', data!, true);
     }
 
+    // TODO: can simplify this
     async uploadResources(msg: PacketMsg[], groupUin: number = 0) {
         const reqList = [];
         for (const m of msg) {
@@ -135,7 +136,7 @@ export class NTQQPacketApi {
                 }
             }
         }
-        return Promise.all(reqList);
+        return Promise.all(reqList);  // TODO: use promise.allSettled
     }
 
     async sendUploadForwardMsg(msg: PacketMsg[], groupUin: number = 0) {
diff --git a/src/core/packet/highway/uploader.ts b/src/core/packet/highway/uploader.ts
index 4b4a864f..d19dd2f7 100644
--- a/src/core/packet/highway/uploader.ts
+++ b/src/core/packet/highway/uploader.ts
@@ -94,6 +94,7 @@ export class HighwayTcpUploader extends HighwayUploader {
             const handleRspHeader = (header: Buffer) => {
                 const rsp = new NapProtoMsg(RespDataHighwayHead).decode(header);
                 if (rsp.errorCode !== 0) {
+                    // TODO: immediately reject promise if error code is not 0
                     this.logger.logWarn(`[Highway] tcpUpload failed (code: ${rsp.errorCode})`);
                 }
                 const percent = ((Number(rsp.msgSegHead?.dataOffset) + Number(rsp.msgSegHead?.dataLength)) / Number(rsp.msgSegHead?.filesize)).toFixed(2);
@@ -159,6 +160,7 @@ export class HighwayHttpUploader extends HighwayUploader {
         const headData = new NapProtoMsg(RespDataHighwayHead).decode(head);
         this.logger.logDebug(`[Highway] httpUploadBlock: ${headData.errorCode} | ${headData.msgSegHead?.retCode} | ${headData.bytesRspExtendInfo} | ${head.toString('hex')} | ${body.toString('hex')}`);
         if (headData.errorCode !== 0) {
+            // TODO: immediately throw error if error code is not 0
             this.logger.logError(`[Highway] httpUploadBlock failed (code=${headData.errorCode})`);
         }
     }
diff --git a/src/core/packet/packer.ts b/src/core/packet/packer.ts
index 13e40846..b3f8dd74 100644
--- a/src/core/packet/packer.ts
+++ b/src/core/packet/packer.ts
@@ -34,6 +34,7 @@ export class PacketPacker {
         this.packetConverter = new PacketMsgConverter(logger);
     }
 
+    // TODO: 一步到位多好ww
     private toHexStr(byteArray: Uint8Array): PacketHexStr {
         return Buffer.from(byteArray).toString('hex') as PacketHexStr;
     }