Phone extension number not appearing on 'Event Info' page.

I created an online event registration page. On 'Event Location' page I filled up my phone number and extension.But on 'Event Info' page I did not see my phone number extension. I replicated same steps in CiviCRM demo site. My phone number extension not appeared on Event Links ->
'Event Info' Page.

Now what I did is,

In civicrm/templates/CRM/Event/Page/EventInfo.tpl line no 165

I removed the line <span class="tel">{$phone.phone}</span> <br />
and added <span class="tel">{$phone.phone} {$phone.phone_ext}</span> <br />

and in civicrm/templates/CRM/Event/Form/Registration/EventInfoBlock.tpl line no 74

I removed the line

{if $phone.phone_type}{$phone.phone_type_display}{else}{ts}Phone{/ts}{/if}: {$phone.phone}
and added {if $phone.phone_type}

{$phone.phone_type_display}

{else} {ts}

Phone

{/ts} {/if}

: {$phone.phone} {$phone.phone_ext}

Now my phone number extension appearing on 'Event Info' page. Is that correct way or some thing I am missing while creating event page ?