diff --git a/man2/chmod.2 b/man2/chmod.2
index b46c0faf9..5ec6bccca 100644
--- a/man2/chmod.2
+++ b/man2/chmod.2
@@ -335,6 +335,7 @@ library support was added to glibc in version 2.4.
 .BR fchmodat ():
 POSIX.1-2008.
 .SH NOTES
+.SS C library/kernel ABI differences
 The GNU C library
 .BR fchmodat ()
 wrapper function implements the POSIX-specified