diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index d6bd37758e33..c93dbadfc71d 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -404,7 +404,7 @@ struct acpi_table_dbgp {
  *        Version 1
  *
  * Conforms to "Intel Virtualization Technology for Directed I/O",
- * Version 2.2, Sept. 2013
+ * Version 2.3, October 2014
  *
  ******************************************************************************/
 
@@ -418,6 +418,8 @@ struct acpi_table_dmar {
 /* Masks for Flags field above */
 
 #define ACPI_DMAR_INTR_REMAP        (1)
+#define ACPI_DMAR_X2APIC_OPT_OUT    (1<<1)
+#define ACPI_DMAR_X2APIC_MODE       (1<<2)
 
 /* DMAR subtable header */