diff --git a/doc/README.gpt b/doc/README.gpt
index 59fdeeb..6e298d2 100644
--- a/doc/README.gpt
+++ b/doc/README.gpt
@@ -31,7 +31,8 @@ More often UUID is displayed as 32 hexadecimal digits, in 5 groups,
 separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
 (32 digits and 4 hyphens)
 
-For instance, GUID of Linux data partition: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
+For instance, GUID of Basic data partition: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
+and GUID of Linux filesystem data: 0FC63DAF-8483-4772-8E79-3D69D8477DE4
 
 Historically there are 5 methods to generate this number. The oldest one is
 combining machine's MAC address and timer (epoch) value.
diff --git a/include/part_efi.h b/include/part_efi.h
index 3012b91..c8fc873 100644
--- a/include/part_efi.h
+++ b/include/part_efi.h
@@ -43,6 +43,9 @@
 #define PARTITION_BASIC_DATA_GUID \
 	EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
 		0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
+#define PARTITION_LINUX_FILE_SYSTEM_DATA_GUID \
+	EFI_GUID(0x0FC63DAF, 0x8483, 0x4772, \
+		0x8E, 0x79, 0x3D, 0x69, 0xD8, 0x47, 0x7D, 0xE4)
 #define PARTITION_LINUX_RAID_GUID \
 	EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
 		0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)