diff --git a/man2/posix_fadvise.2 b/man2/posix_fadvise.2
index 8d7f6a3b3..982c3eeb6 100644
--- a/man2/posix_fadvise.2
+++ b/man2/posix_fadvise.2
@@ -112,6 +112,13 @@ the underlying system call is called
 Library support has been provided since glibc version 2.2,
 via the wrapper function
 .BR posix_fadvise ().
+
+Since Linux 3.18,
+.\" commit d3ac21cacc24790eb45d735769f35753f5b56ceb
+support for the underlying system call is optional,
+depending on the setting of the
+.B CONFIG_ADVISE_SYSCALLS
+configuration option.
 .SH CONFORMING TO
 POSIX.1-2001.
 Note that the type of the