diff --git a/graphic/graphic_2d/native_vsync/native_vsync.h b/graphic/graphic_2d/native_vsync/native_vsync.h
index 7c2f123d6f95c6dcb90dc6b56858312a9e74cf3d..38d77dab5c7783758f223df3c96fe0d685e2238a 100644
--- a/graphic/graphic_2d/native_vsync/native_vsync.h
+++ b/graphic/graphic_2d/native_vsync/native_vsync.h
@@ -118,6 +118,8 @@ int OH_NativeVSync_RequestFrameWithMultiCallback(
 
 /**
  * @brief Get vsync period.
+ * This interface uses a prerequisite that the OH_NativeVSync object in the input parameter
+ * has called OH_NativeVSync_RequestFrame() and received a signal callback.
  *
  * @syscap SystemCapability.Graphic.Graphic2D.NativeVsync
  * @param nativeVsync Indicates the pointer to a NativeVsync.