diff --git a/include/uapi/linux/fsmap.h b/include/uapi/linux/fsmap.h
index 7e8e5f0bd6d263c7a9e583a255810f5b85f96441..e5213c3e38b2104b28e3f6ea621dbdf757e8efa8 100644
--- a/include/uapi/linux/fsmap.h
+++ b/include/uapi/linux/fsmap.h
@@ -96,7 +96,7 @@ fsmap_advance(
 #define FMR_OF_EXTENT_MAP	0x4	/* segment = extent map */
 #define FMR_OF_SHARED		0x8	/* segment = shared with another file */
 #define FMR_OF_SPECIAL_OWNER	0x10	/* owner is a special value */
-#define FMR_OF_LAST		0x20	/* segment is the last in the FS */
+#define FMR_OF_LAST		0x20	/* segment is the last in the dataset */
 
 /* Each FS gets to define its own special owner codes. */
 #define FMR_OWNER(type, code)	(((__u64)type << 32) | \