diff --git a/man2/futex.2 b/man2/futex.2
index fea5e4ac3..78e3de032 100644
--- a/man2/futex.2
+++ b/man2/futex.2
@@ -50,7 +50,7 @@
 .\"
 .\"	See Documentation/futex-requeue-pi.txt
 .\"
-.TH FUTEX 2 2013-07-30 "Linux" "Linux Programmer's Manual"
+.TH FUTEX 2 2013-09-04 "Linux" "Linux Programmer's Manual"
 .SH NAME
 futex \- fast user-space locking
 .SH SYNOPSIS
@@ -116,8 +116,13 @@ and sleeps awaiting
 on this futex address.
 If the
 .I timeout
-argument is non-NULL, its contents describe the minimum
-duration of the wait, which is infinite otherwise.
+argument is non-NULL, its contents specify the duration of the wait.
+(This interval will be rounded up to the system clock granularity,
+and kernel scheduling delays mean that the
+blocking interval may overrun by a small amount.)
+If
+.I timeout
+is NULL, the call blocks indefinitely.
 The arguments
 .I uaddr2
 and