diff --git a/api/include/mk_frame.h b/api/include/mk_frame.h
index e7a7c7f0..cbc5fe76 100644
--- a/api/include/mk_frame.h
+++ b/api/include/mk_frame.h
@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
  *
  * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
diff --git a/api/include/mk_track.h b/api/include/mk_track.h
index e1d88bf6..aa6b5f38 100644
--- a/api/include/mk_track.h
+++ b/api/include/mk_track.h
@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
  *
  * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
diff --git a/api/include/mk_webrtc_api.h b/api/include/mk_webrtc_api.h
index b4b22cc8..80ec8332 100644
--- a/api/include/mk_webrtc_api.h
+++ b/api/include/mk_webrtc_api.h
@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
  *
  * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
diff --git a/api/source/mk_frame.cpp b/api/source/mk_frame.cpp
index eb870887..55771afa 100644
--- a/api/source/mk_frame.cpp
+++ b/api/source/mk_frame.cpp
@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
  *
  * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
diff --git a/api/source/mk_track.cpp b/api/source/mk_track.cpp
index a9891d95..6d84ac70 100644
--- a/api/source/mk_track.cpp
+++ b/api/source/mk_track.cpp
@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
  *
  * This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).