diff --git a/man2/futex.2 b/man2/futex.2
index 01656da56..bf479e424 100644
--- a/man2/futex.2
+++ b/man2/futex.2
@@ -418,7 +418,7 @@ plus the number of waiters woken on the futex
 .TP
 .BR FUTEX_WAIT_BITSET " (since Linux 2.6.25)"
 .\" commit cd689985cf49f6ff5c8eddc48d98b9d581d9475d
-This operation is the same as
+This operation is like
 .BR FUTEX_WAIT
 except that
 .I val3
@@ -428,6 +428,16 @@ See the description of
 .BR FUTEX_WAKE_BITSET
 for further details.
 
+The
+.BR FUTEX_WAIT_BITSET
+also interprets the
+.I timeout
+argument differently from
+.BR FUTEX_WAIT .
+See the discussion of
+.BR FUTEX_CLOCK_REALTIME ,
+above.
+
 The
 .I uaddr2
 argument is ignored.