diff --git a/man2/getpid.2 b/man2/getpid.2
index ec0cc68c0..089ad9e6d 100644
--- a/man2/getpid.2
+++ b/man2/getpid.2
@@ -46,6 +46,7 @@ These functions are always successful.
 .SH CONFORMING TO
 POSIX.1-2001, 4.3BSD, SVr4.
 .SH NOTES
+.SS C library/kernel ABI differences
 Since glibc version 2.3.4,
 the glibc wrapper function for
 .BR getpid ()