diff --git a/man2/futex.2 b/man2/futex.2
index c1f7cc289..c294ecea5 100644
--- a/man2/futex.2
+++ b/man2/futex.2
@@ -852,6 +852,11 @@ read the sources of the futex user-space library referenced below.
 .BR restart_syscall (2),
 .BR futex (7)
 .PP
+The kernel source files
+.IR Documentation/pi-futex.txt
+and
+.IR Documentation/futex-requeue-pi.txt .
+.PP
 \fIFuss, Futexes and Furwocks: Fast Userlevel Locking in Linux\fP
 (proceedings of the Ottawa Linux Symposium 2002), online at
 .br