diff --git a/trunk/auto/depends.sh b/trunk/auto/depends.sh
index 5f31f77c4..10feffc55 100755
--- a/trunk/auto/depends.sh
+++ b/trunk/auto/depends.sh
@@ -227,6 +227,8 @@ fi
 if [ $SRS_EXPORT_LIBRTMP_PROJECT = NO ]; then
     # check the arm flag file, if flag changed, need to rebuild the st.
     _ST_MAKE=linux-debug
+    # memory leak for linux-optimized
+    # @see: https://github.com/winlinvip/simple-rtmp-server/issues/197
     if [ $SRS_EMBEDED_CPU = YES ]; then
         # ok, arm specified, if the flag filed does not exists, need to rebuild.
         if [[ -f ${SRS_OBJS}/_flag.st.arm.tmp && -f ${SRS_OBJS}/st/libst.a ]]; then
diff --git a/trunk/src/app/srs_app_rtmp_conn.cpp b/trunk/src/app/srs_app_rtmp_conn.cpp
index 53f466186..e9bcf5f94 100644
--- a/trunk/src/app/srs_app_rtmp_conn.cpp
+++ b/trunk/src/app/srs_app_rtmp_conn.cpp
@@ -528,8 +528,8 @@ int SrsRtmpConn::playing(SrsSource* source)
         // collect elapse for pithy print.
         pithy_print.elapse();
 
-        // read message when no data to send.
-        // @see: https://github.com/winlinvip/simple-rtmp-server/issues/194
+        // to use isolate thread to recv, can improve about 5% performance.
+        // @see: https://github.com/winlinvip/simple-rtmp-server/issues/196
         // read from client.
         if (true) {
             SrsMessage* msg = NULL;