diff --git a/man2/futex.2 b/man2/futex.2
index 9a1c3eb62..aa6f54102 100644
--- a/man2/futex.2
+++ b/man2/futex.2
@@ -817,7 +817,6 @@ arguments are ignored.
 .BR FUTEX_CMP_REQUEUE_PI " (since Linux 2.6.31)"
 .\" commit 52400ba946759af28442dee6265c5c0180ac7122
 .\" FIXME to complete
-
 This operation is a PI-aware variant of
 .BR FUTEX_CMP_REQUEUE .
 It requeues waiters that are blocked via
@@ -829,8 +828,27 @@ from a non-PI source futex
 to a PI target futex
 .RI ( uaddr2 ).
 
+As with
+.BR FUTEX_CMP_REQUEUE ,
+this operation wakes up a maximum of
+.I val
+waiters that are waiting on the futex at
+.IR uaddr .
+However, for
+.BR FUTEX_CMP_REQUEUE_PI ,
+.I val
+is required to be 1.
+The remaining waiters are removed from the wait queue of the source futex at
+.I uaddr
+and added to the wait queue of the target futex at
+.IR uaddr2 .
 
-
+The
+.I val3
+and
+.I timeout
+arguments serve the same purposes as for
+.BR FUTEX_CMP_REQUEUE .
 .TP
 .BR FUTEX_WAIT_REQUEUE_PI " (since Linux 2.6.31)"
 .\" commit 52400ba946759af28442dee6265c5c0180ac7122