diff --git a/include/ntfs/volume.h b/include/ntfs/volume.h
index da395e27..a25ef156 100644
--- a/include/ntfs/volume.h
+++ b/include/ntfs/volume.h
@@ -93,7 +93,7 @@ typedef enum {
  * NTFS version 1.1 and 1.2 are used by Windows NT4.
  * NTFS version 2.x is used by Windows 2000 Beta
  * NTFS version 3.0 is used by Windows 2000.
- * NTFS version 3.1 is used by Windows XP and Windows Server 2003.
+ * NTFS version 3.1 is used by Windows XP, Windows Server 2003 and Longhorn.
  */
 
 #define NTFS_V1_1(major, minor) ((major) == 1 && (minor) == 1)
diff --git a/libntfs/volume.c b/libntfs/volume.c
index 78d5d61b..9c771362 100644
--- a/libntfs/volume.c
+++ b/libntfs/volume.c
@@ -1183,7 +1183,7 @@ int ntfs_check_if_mounted(const char *file __attribute__((unused)),
  * Version 1.1 and 1.2 are used by Windows NT3.x and NT4.
  * Version 2.x is used by Windows 2000 Betas.
  * Version 3.0 is used by Windows 2000.
- * Version 3.1 is used by Windows XP and Windows Server 2003.
+ * Version 3.1 is used by Windows XP, Windows Server 2003 and Longhorn.
  *
  * Return 0 if NTFS version is supported otherwise -1 with errno set.
  *