diff --git a/trunk/conf/full.conf b/trunk/conf/full.conf
index ff17617d9..7304edd06 100644
--- a/trunk/conf/full.conf
+++ b/trunk/conf/full.conf
@@ -432,7 +432,7 @@ rtc_server {
     encrypt         on;
     # We listen multiple times at the same port, by REUSEPORT, to increase the UDP queue.
     # Note that you can set to 1 and increase the system UDP buffer size by net.core.rmem_max
-    # or just increase this to get larger UDP recv and send buffer.
+    # and net.core.rmem_default or just increase this to get larger UDP recv and send buffer.
     # default: 4
     reuseport       4;
 }
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index 3c96e69c4..bdaa197f0 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -1719,7 +1719,8 @@ srs_error_t SrsRtcServer::cycle()
                     pps_last = (int)((nn_msgs - nn_msgs_last) * SRS_UTIME_SECONDS / (srs_get_system_time() - time_last));
                 }
             }
-            srs_trace("-> RTC SEND %d by sendmmsg %d, total %" PRId64 ", pps %d/%d", pos, max_sendmmsg, nn_msgs, pps_average, pps_last);
+            srs_trace("-> RTC SEND %d by sendmmsg %d, total %" PRId64 ", pps %d/%d, sessions %d/%d",
+                pos, max_sendmmsg, nn_msgs, pps_average, pps_last, (int)map_username_session.size(), (int)map_id_session.size());
             nn_msgs_last = nn_msgs; time_last = srs_get_system_time();
         }
     }