diff --git a/man5/proc.5 b/man5/proc.5
index 5e9a359bd..5302697fd 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -2064,8 +2064,9 @@ that the system spent in various states:
 .I idle
 (4) Time spent in the idle task.
 .\" FIXME Actually, the following info about the /proc/stat 'cpu' field
-.\"       does not seem to be quite right (at least in 2.6.12)
-This  value should be USER_HZ times the
+.\"       does not seem to be quite right (at least in 2.6.12 or 3.6):
+.\"       the idle time in /proc/uptime does not quite match this value
+This value should be USER_HZ times the
 second entry in the uptime pseudo-file.
 .TP
 .IR iowait " (since Linux 2.5.41)"