diff --git a/udev/udevadm-monitor.c b/udev/udevadm-monitor.c
index 4063c48303c..d136c6070ab 100644
--- a/udev/udevadm-monitor.c
+++ b/udev/udevadm-monitor.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004-2009 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2010 Kay Sievers <kay.sievers@vrfy.org>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -111,7 +111,7 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
 				char *devtype;
 
 				util_strscpy(subsys, sizeof(subsys), optarg);
-				devtype = strchr(subsys, ':');
+				devtype = strchr(subsys, '/');
 				if (devtype != NULL) {
 					devtype[0] = '\0';
 					devtype++;
@@ -121,10 +121,10 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
 			}
 		case 'h':
 			printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
-			       "  --property                    print the event properties\n"
-			       "  --kernel                      print kernel uevents\n"
-			       "  --udev                        print udev events\n"
-			       "  --subsystem-match=<subsystem> filter events\n"
+			       "  --property                              print the event properties\n"
+			       "  --kernel                                print kernel uevents\n"
+			       "  --udev                                  print udev events\n"
+			       "  --subsystem-match=<subsystem[/devtype]> filter events by subsystem\n"
 			       "  --help\n\n");
 		default:
 			goto out;
diff --git a/udev/udevadm.xml b/udev/udevadm.xml
index ad492494a11..fa1742badae 100644
--- a/udev/udevadm.xml
+++ b/udev/udevadm.xml
@@ -349,6 +349,12 @@
                 <para>Also print the properties of the event.</para>
               </listitem>
             </varlistentry>
+            <varlistentry>
+              <term><option>--subsystem-match=<replaceable>string[/string]</replaceable></option></term>
+              <listitem>
+                <para>Filter events by subsystem[/devtype]. Only udev events with a matching subsystem value will pass.</para>
+              </listitem>
+            </varlistentry>
             <varlistentry>
               <term><option>--help</option></term>
               <listitem>