diff --git a/cocos/2d/ZipUtils.h b/cocos/2d/ZipUtils.h
index 3fecf2ccba..da5ec54673 100644
--- a/cocos/2d/ZipUtils.h
+++ b/cocos/2d/ZipUtils.h
@@ -32,6 +32,7 @@ THE SOFTWARE.
 #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
 #include "platform/android/CCFileUtilsAndroid.h"
 #elif(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
+// for import ssize_t on win32 platform
 #include "CCStdC.h"
 #endif
 
diff --git a/cocos/editor-support/spine/extension.h b/cocos/editor-support/spine/extension.h
index 7c2f6d5788..a8f64b1b19 100644
--- a/cocos/editor-support/spine/extension.h
+++ b/cocos/editor-support/spine/extension.h
@@ -54,6 +54,7 @@
 #ifndef SPINE_EXTENSION_H_
 #define SPINE_EXTENSION_H_
 
+// for import ssize_t on win32 platform
 #if defined(_MSC_VER)
 #include "CCStdC.h"
 #endif