When you are going to develop custom layout of your SharePoint site, it could be requirement of having footer in the page. V4 master page does not contain any options to set footer in page.
You need to add footer manually to your custom master page.
If you check your master page you will find below line
Just above that line you can add your custom footer section as below sample markup.
Style for above div
*Customized foooter */
#s4-customfooter{
clear: both;
padding: 10px;
color: #ffffff;
background-color: #4F5E85;
}
Hope this will help!!
