diff --git a/man2/perfmonctl.2 b/man2/perfmonctl.2
index b376126a1..319712e6d 100644
--- a/man2/perfmonctl.2
+++ b/man2/perfmonctl.2
@@ -196,12 +196,18 @@ On error, \-1 is returned and
 is set to indicate the error.
 .SH VERSIONS
 .BR perfmonctl ()
-is available since Linux 2.4.
+was added in Linux 2.4;
+.\" commit ecf5b72d5f66af843f189dfe9ce31598c3e48ad7
+it was removed in Linux 5.10.
 .SH CONFORMING TO
 .BR perfmonctl ()
 is Linux-specific and is available only on the IA-64 architecture.
 .SH NOTES
-Glibc does not provide a wrapper for this system call; call it using
+This system call was broken for many years,
+and ultimately removed in Linux 5.10.
+.PP
+Glibc does not provide a wrapper for this system call;
+on kernels where it exists, call it using
 .BR syscall (2).
 .SH SEE ALSO
 .BR gprof (1)