diff --git a/trunk/src/app/srs_app_hourglass.cpp b/trunk/src/app/srs_app_hourglass.cpp
index 71b1c4f44..a2f36bd1b 100644
--- a/trunk/src/app/srs_app_hourglass.cpp
+++ b/trunk/src/app/srs_app_hourglass.cpp
@@ -65,6 +65,11 @@ srs_error_t SrsHourGlass::start()
     return err;
 }
 
+void SrsHourGlass::stop()
+{
+    trd->stop();
+}
+
 srs_error_t SrsHourGlass::tick(srs_utime_t interval)
 {
     return tick(0, interval);
diff --git a/trunk/src/app/srs_app_hourglass.hpp b/trunk/src/app/srs_app_hourglass.hpp
index 90e59476c..ca10e4964 100644
--- a/trunk/src/app/srs_app_hourglass.hpp
+++ b/trunk/src/app/srs_app_hourglass.hpp
@@ -60,11 +60,11 @@ public:
 // It's a complex and high-performance timer.
 //
 // Usage:
-//      SrsHourGlass* hg = new SrsHourGlass(handler, 1 * SRS_UTIME_MILLISECONDS);
+//      SrsHourGlass* hg = new SrsHourGlass(handler, 100 * SRS_UTIME_MILLISECONDS);
 //
-//      hg->tick(1, 3 * SRS_UTIME_MILLISECONDS);
-//      hg->tick(2, 5 * SRS_UTIME_MILLISECONDS);
-//      hg->tick(3, 7 * SRS_UTIME_MILLISECONDS);
+//      hg->tick(1, 300 * SRS_UTIME_MILLISECONDS);
+//      hg->tick(2, 500 * SRS_UTIME_MILLISECONDS);
+//      hg->tick(3, 700 * SRS_UTIME_MILLISECONDS);
 //
 //      // The hg will create a thread for timer.
 //      hg->start();
@@ -86,8 +86,9 @@ public:
     SrsHourGlass(std::string label, ISrsHourGlass* h, srs_utime_t resolution);
     virtual ~SrsHourGlass();
 public:
-    // Start the hourglass.
+    // Start or stop the hourglass.
     virtual srs_error_t start();
+    virtual void stop();
 public:
     // Add a pair of tick(event, interval).
     // @param event the event of tick, default is 0.