fix
diff --git a/kernel/fuse_kernel.h b/kernel/fuse_kernel.h
index e1d8a0c..c668c68 100644
--- a/kernel/fuse_kernel.h
+++ b/kernel/fuse_kernel.h
@@ -63,6 +63,7 @@
 	__u32	type;
 };
 
+/** Valid attribute mask used in the SETATTR request */
 #define FATTR_MODE	(1 << 0)
 #define FATTR_UID	(1 << 1)
 #define FATTR_GID	(1 << 2)
@@ -71,6 +72,12 @@
 #define FATTR_MTIME	(1 << 5)
 #define FATTR_CTIME	(1 << 6)
 
+/**
+ * Flags returned by the OPEN request
+ *
+ * FOPEN_DIRECT_IO: bypass page cache for this open file
+ * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
+ */
 #define FOPEN_DIRECT_IO		(1 << 0)
 #define FOPEN_KEEP_CACHE	(1 << 1)