diff --git a/man2/mount.2 b/man2/mount.2
index 75f0519cc..2a03e1330 100644
--- a/man2/mount.2
+++ b/man2/mount.2
@@ -86,6 +86,8 @@ in the top 16 bits (this was required in kernel versions prior to 2.4, but
 is no longer required and ignored if specified),
 and various mount flags (as defined in <linux/fs.h> for libc4 and libc5
 and in <sys/mount.h> for glibc2) in the low order 16 bits:
+.\" FIXME 2.6.15-rc1 has MS_UNBINDABLE, MS_PRIVATE, MS_SHARED, MS_SLAVE
+.\" See Documentation/sharedsubtree.txt
 .TP
 .B MS_BIND
 (Linux 2.4 onwards)