Add small comment
diff --git a/util/mtp-hotplug.c b/util/mtp-hotplug.c
index 9478643..b2e4205 100644
--- a/util/mtp-hotplug.c
+++ b/util/mtp-hotplug.c
@@ -204,7 +204,7 @@
      * This is code that invokes the mtp-probe program on
      * every USB device that is either PTP or vendor specific
      */
-    printf("\n# Autoprobe vendor-specific and PTP devices\n");
+    printf("\n# Autoprobe vendor-specific, communication and PTP devices\n");
     printf("ENV{ID_MTP_DEVICE}!=\"1\", ATTR{bDeviceClass}==\"00|02|06|ff\", PROGRAM=\"/lib/udev/mtp-probe /sys$env{DEVPATH} $attr{busnum} $attr{devnum}\", RESULT==\"1\", %s\n", action);
     printf("\nLABEL=\"libmtp_rules_end\"\n");
     break;