diff --git a/examples/vulkan.c b/examples/vulkan.c
index e039eea..5ecefda 100644
--- a/examples/vulkan.c
+++ b/examples/vulkan.c
@@ -1,15 +1,14 @@
 /* $Id$ */
+
+/**
+ * this example is quite minimal, you may need to modify it if your graphics card is more esoteric
+ *
+ * ioixd maintains this file. nishi doesn't know vulkan at all
+ */
+
 #include <Mw/Milsko.h>
 #include <Mw/Vulkan.h>
 
-#include <X11/Xlib.h>
-#include <assert.h>
-
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <unistd.h>
 #include <vulkan/vulkan.h>
 #include <vulkan/vulkan_core.h>
 #include <vulkan/vk_enum_string_helper.h>
diff --git a/include/Mw/MachDep.h b/include/Mw/MachDep.h
index 894bd63..c42b984 100644
--- a/include/Mw/MachDep.h
+++ b/include/Mw/MachDep.h
@@ -11,6 +11,8 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <setjmp.h>
+#include <sys/types.h>
+#include <assert.h>
 #ifdef _WIN32
 #include <windows.h>
 #else
diff --git a/src/vulkan.c b/src/vulkan.c
index 23cbd7e..ad6e217 100644
--- a/src/vulkan.c
+++ b/src/vulkan.c
@@ -20,7 +20,6 @@
 #endif
 
 #include <dlfcn.h>
-#include <assert.h>
 #include <stdbool.h>
 
 #include "stb_ds.h"