diff --git a/man/NetworkManager.conf.5.in b/man/NetworkManager.conf.5.in
index ba575c9415..c866f1b337 100644
--- a/man/NetworkManager.conf.5.in
+++ b/man/NetworkManager.conf.5.in
@@ -2,7 +2,7 @@
 .\"
 .\" Copyright (C) 2010 Red Hat, Inc.
 .\"
-.TH "NetworkManager.conf" "5" "16 September 2010" ""
+.TH "NetworkManager.conf" "5" "23 November 2010" ""
 .SH NAME
 NetworkManager.conf \- NetworkManager configuration file
 .SH SYNOPSIS
@@ -129,10 +129,12 @@ Set a persistent hostname when using the \fIkeyfile\fP plugin.
 .B unmanaged-devices=\fImac:<hwaddr>\fP;\fImac:<hwaddr>\fP;...
 Set devices that should be ignored by NetworkManager when using the \fIkeyfile\fP
 plugin. Devices are specified in the following format: "mac:<hwaddr>", where
-<hwaddr> is MAC address of the device to be ignored, in lowercase. Multiple
-entries are separated by a semicolon. Example:
+<hwaddr> is MAC address of the device to be ignored, in hex-digits-and-colons notation.
+Multiple entries are separated by a semicolon. No spaces are allowed in the value.
+.br
+Example:
 .nf
-unmanaged-devices=mac:00:22:68:1c:59:b1;mac:00:1e:65:30:d1:c4
+unmanaged-devices=mac:00:22:68:1c:59:b1;mac:00:1E:65:30:D1:C4
 .fi
 .SS [ifupdown]
 This section contains ifupdown-specific options and thus only has effect when using \fIifupdown\fP plugin.