diff --git a/reactos/include/psdk/reason.h b/reactos/include/psdk/reason.h
new file mode 100644
index 00000000000..9c8e320af16
--- /dev/null
+++ b/reactos/include/psdk/reason.h
@@ -0,0 +1,52 @@
+#ifndef _REASON_H
+#define _REASON_H
+
+#if __GNUC__ >=3
+#pragma GCC system_header
+#endif
+
+#if _WIN32_WINNT >= 0x0501
+
+#define SHTDN_REASON_MAJOR_APPLICATION     0x00040000
+#define SHTDN_REASON_MAJOR_HARDWARE        0x00010000
+#define SHTDN_REASON_MAJOR_LEGACY_API      0x00070000
+#define SHTDN_REASON_MAJOR_OPERATINGSYSTEM 0x00020000
+#define SHTDN_REASON_MAJOR_OTHER           0x00000000
+#define SHTDN_REASON_MAJOR_POWER           0x00060000
+#define SHTDN_REASON_MAJOR_SOFTWARE        0x00030000
+#define SHTDN_REASON_MAJOR_SYSTEM          0x00050000
+
+#define SHTDN_REASON_MINOR_BLUESCREEN            0x0000000f
+#define SHTDN_REASON_MINOR_CORDUNPLUGGED         0x0000000b
+#define SHTDN_REASON_MINOR_DISK                  0x00000007
+#define SHTDN_REASON_MINOR_ENVIRONMENT           0x0000000c
+#define SHTDN_REASON_MINOR_HARDWARE_DRIVER       0x0000000d
+#define SHTDN_REASON_MINOR_HOTFIX                0x00000011
+#define SHTDN_REASON_MINOR_HOTFIX_UNINSTALL      0x00000017
+#define SHTDN_REASON_MINOR_HUNG                  0x00000005
+#define SHTDN_REASON_MINOR_INSTALLATION          0x00000002
+#define SHTDN_REASON_MINOR_MAINTENANCE           0x00000001
+#define SHTDN_REASON_MINOR_MMC                   0x00000019
+#define SHTDN_REASON_MINOR_NETWORK_CONNECTIVITY  0x00000014
+#define SHTDN_REASON_MINOR_NETWORKCARD           0x00000009
+#define SHTDN_REASON_MINOR_OTHER                 0x00000000
+#define SHTDN_REASON_MINOR_OTHERDRIVER           0x0000000e
+#define SHTDN_REASON_MINOR_POWER_SUPPLY          0x0000000a
+#define SHTDN_REASON_MINOR_PROCESSOR             0x00000008
+#define SHTDN_REASON_MINOR_RECONFIG              0x00000004
+#define SHTDN_REASON_MINOR_SECURITY              0x00000013
+#define SHTDN_REASON_MINOR_SECURITYFIX           0x00000012
+#define SHTDN_REASON_MINOR_SECURITYFIX_UNINSTALL 0x00000018
+#define SHTDN_REASON_MINOR_SERVICEPACK           0x00000010
+#define SHTDN_REASON_MINOR_SERVICEPACK_UNINSTALL 0x00000016
+#define SHTDN_REASON_MINOR_TERMSRV               0x00000020
+#define SHTDN_REASON_MINOR_UNSTABLE              0x00000006
+#define SHTDN_REASON_MINOR_UPGRADE               0x00000003
+#define SHTDN_REASON_MINOR_WMI                   0x00000015
+
+#define SHTDN_REASON_FLAG_USER_DEFINED           0x40000000
+#define SHTDN_REASON_FLAG_PLANNED                0x80000000
+
+#endif /* WIN32_WINNT >= 0x0501 */
+
+#endif /* _REASON_H */