diff --git a/trunk/src/app/srs_app_rtp.cpp b/trunk/src/app/srs_app_rtp.cpp
index 0101e30c52..58d5942489 100644
--- a/trunk/src/app/srs_app_rtp.cpp
+++ b/trunk/src/app/srs_app_rtp.cpp
@@ -77,6 +77,7 @@ srs_error_t SrsRtpMuxer::frame_to_packet(SrsSharedPtrMessage* shared_frame, SrsF
         uint8_t header = sample.bytes[0];
         uint8_t nal_type = header & kNalTypeMask;
 
+        // TODO: FIXME: Magic number? Doc?
         // ignore SEI nal
         if (nal_type == 0x06 || nal_type == 0x09) {
             continue;
@@ -253,6 +254,7 @@ void SrsRtp::dispose()
     }
 }
 
+// TODO: FIXME: Dead code?
 srs_error_t SrsRtp::cycle()
 {
     srs_error_t err = srs_success;
@@ -338,7 +340,8 @@ srs_error_t SrsRtp::on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* forma
 srs_error_t SrsRtp::on_video(SrsSharedPtrMessage* shared_video, SrsFormat* format)
 {
     srs_error_t err = srs_success;
-    
+
+    // TODO: FIXME: Maybe it should config on vhost level.
     if (!enabled) {
         return err;
     }
diff --git a/trunk/src/app/srs_app_source.cpp b/trunk/src/app/srs_app_source.cpp
index 3c3c07c67d..2ef7824a1a 100755
--- a/trunk/src/app/srs_app_source.cpp
+++ b/trunk/src/app/srs_app_source.cpp
@@ -1122,15 +1122,20 @@ srs_error_t SrsOriginHub::on_video(SrsSharedPtrMessage* shared_video, bool is_se
         return err;
     }
 
+    // Parse RTMP message to RTP packets, in FU-A if too large.
     if ((err = rtp->on_video(msg, format)) != srs_success) {
+        // TODO: We should support more strategies.
         srs_warn("rtp: ignore video error %s", srs_error_desc(err).c_str());
         srs_error_reset(err);
         rtp->on_unpublish();
     }
 
+    // TODO: FIXME: Refactor to move to rtp?
+    // Save the RTP packets for find_rtp_packet() to rtx or restore it.
     source->rtp_queue->push(msg->rtp_packets);
     
     if ((err = hls->on_video(msg, format)) != srs_success) {
+        // TODO: We should support more strategies.
         // apply the error strategy for hls.
         // @see https://github.com/ossrs/srs/issues/264
         std::string hls_error_strategy = _srs_config->get_hls_on_error(req->vhost);