mention required mibs

lib/SNMP/Info/CiscoStpExtensions.pm

@@ -277,7 +277,7 @@ Carlos Vicente
 
 =head1 SYNOPSIS
 
-   my $ciscostpext = new SNMP::Info(
+   my $stpx = new SNMP::Info(
                          AutoSpecify => 1,
                          Debug       => 1,
                          DestHost    => 'myswitch',
@@ -287,7 +287,7 @@ Carlos Vicente
 
    or die "Can't connect to DestHost.\n";
 
-   my $class = $ciscostpext->class();
+   my $class = $stpx->class();
    print " Using device sub class : $class\n";
 
 =head1 DESCRIPTION
@@ -309,6 +309,14 @@ For debugging you can call new() directly as you would in SNMP::Info
 
 =back
 
+=head2 Required MIBs
+
+=over
+
+=item F<CISCO-STP-EXTENSIONS-MIB>
+
+=back
+
 MIBs can be found at ftp://ftp.cisco.com/pub/mibs/v2/v2.tar.gz
 
 =head1 GLOBAL METHODS