diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index e81267f..b3de526 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -464,7 +464,7 @@
         PlaybackThread *thread = checkPlaybackThread_l(output);
         PlaybackThread *effectThread = NULL;
         if (thread == NULL) {
-            ALOGE("unknown output thread");
+            ALOGE("no playback thread found for output handle %d", output);
             lStatus = BAD_VALUE;
             goto Exit;
         }
@@ -589,7 +589,7 @@
     Mutex::Autolock _l(mLock);
     PlaybackThread *thread = checkPlaybackThread_l(output);
     if (thread == NULL) {
-        ALOGW("latency() unknown thread %d", output);
+        ALOGW("latency(): no playback thread found for output handle %d", output);
         return 0;
     }
     return thread->latency();