diff --git a/trunk/src/app/srs_app_source.cpp b/trunk/src/app/srs_app_source.cpp
index d35628096..481fc3b3c 100755
--- a/trunk/src/app/srs_app_source.cpp
+++ b/trunk/src/app/srs_app_source.cpp
@@ -2233,11 +2233,12 @@ srs_error_t SrsLiveSource::on_audio(SrsCommonMessage* shared_audio)
 {
     srs_error_t err = srs_success;
     
-    // monotically increase detect.
+    // Detect where stream is monotonically increasing.
     if (!mix_correct && is_monotonically_increase) {
         if (last_packet_time > 0 && shared_audio->header.timestamp < last_packet_time) {
             is_monotonically_increase = false;
-            srs_warn("AUDIO: stream not monotonically increase, please open mix_correct.");
+            srs_warn("AUDIO: Timestamp %" PRId64 "=>%" PRId64 ", may need mix_correct.",
+                last_packet_time, shared_audio->header.timestamp);
         }
     }
     last_packet_time = shared_audio->header.timestamp;
@@ -2354,12 +2355,13 @@ srs_error_t SrsLiveSource::on_audio_imp(SrsSharedPtrMessage* msg)
 srs_error_t SrsLiveSource::on_video(SrsCommonMessage* shared_video)
 {
     srs_error_t err = srs_success;
-    
-    // monotically increase detect.
+
+    // Detect where stream is monotonically increasing.
     if (!mix_correct && is_monotonically_increase) {
         if (last_packet_time > 0 && shared_video->header.timestamp < last_packet_time) {
             is_monotonically_increase = false;
-            srs_warn("VIDEO: stream not monotonically increase, please open mix_correct.");
+            srs_warn("VIDEO: Timestamp %" PRId64 "=>%" PRId64 ", may need mix_correct.",
+                last_packet_time, shared_video->header.timestamp);
         }
     }
     last_packet_time = shared_video->header.timestamp;