diff --git a/man2/bpf.2 b/man2/bpf.2
index 02f52df0f..b8e75ed55 100644
--- a/man2/bpf.2
+++ b/man2/bpf.2
@@ -775,6 +775,10 @@ limit (maximum number of elements).
 The
 .BR bpf ()
 system call first appeared in Linux 3.18.
+.SH CONFORMING TO
+The
+.BR bpf ()
+system call is Linux-specific.
 .SH NOTES
 These commands may be used only by a privileged process (one having the
 .B CAP_SYS_ADMIN