diff --git a/include/Mw/Vulkan.h b/include/Mw/Vulkan.h
index 4ac3373..6642edb 100644
--- a/include/Mw/Vulkan.h
+++ b/include/Mw/Vulkan.h
@@ -4,6 +4,11 @@
  * %brief Vulkan widget
  * %warning This header is not documented yet
  */
+
+/**
+ * ioixd maintains this file. nishi doesn't know vulkan at all
+ */
+
 #ifndef __MW_VULKAN_H__
 #define __MW_VULKAN_H__
 
diff --git a/src/vulkan.c b/src/vulkan.c
index 40621d2..23cbd7e 100644
--- a/src/vulkan.c
+++ b/src/vulkan.c
@@ -2,6 +2,10 @@
 #include <Mw/Milsko.h>
 #include <Mw/Vulkan.h>
 
+/**
+ * ioixd maintains this file. nishi doesn't know vulkan at all
+ */
+
 #ifdef _WIN32
 #define VK_USE_PLATFORM_WIN32_KHR 1
 #endif