diff --git a/camera/CameraParameters.cpp b/camera/CameraParameters.cpp
index d8fef09..251615d 100644
--- a/camera/CameraParameters.cpp
+++ b/camera/CameraParameters.cpp
@@ -86,6 +86,7 @@
 const char CameraParameters::KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO[] = "preferred-preview-size-for-video";
 const char CameraParameters::KEY_MAX_NUM_DETECTED_FACES_HW[] = "max-num-detected-faces-hw";
 const char CameraParameters::KEY_MAX_NUM_DETECTED_FACES_SW[] = "max-num-detected-faces-sw";
+const char CameraParameters::KEY_RECORDING_HINT[] = "recording-hint";
 
 const char CameraParameters::TRUE[] = "true";
 const char CameraParameters::FALSE[] = "false";
diff --git a/include/camera/CameraParameters.h b/include/camera/CameraParameters.h
index d2f398a..48483fd 100644
--- a/include/camera/CameraParameters.h
+++ b/include/camera/CameraParameters.h
@@ -484,6 +484,17 @@
     // Example value: "yuv420sp" or PIXEL_FORMAT_XXX constants. Read only.
     static const char KEY_VIDEO_FRAME_FORMAT[];
 
+    // Sets the hint of the recording mode. If this is true, MediaRecorder.start
+    // may be faster or has less glitches. This should be called before starting
+    // the preview for the best result. But it is allowed to change the hint
+    // while the preview is active. The default value is false.
+    //
+    // The apps can still call Camera.takePicture when the hint is true. The
+    // apps can call MediaRecorder.start when the hint is false. But the
+    // performance may be worse.
+    // Example value: "true" or "false". Read/write.
+    static const char KEY_RECORDING_HINT[];
+
     // Value for KEY_ZOOM_SUPPORTED or KEY_SMOOTH_ZOOM_SUPPORTED.
     static const char TRUE[];
     static const char FALSE[];