CPanel/WHM - Change Site's IP Address

I need to put one of my already hosted sites onto it's own IP address. The server has 3 spare which are registered to it already. When I go to change the IP address in WHM it tells me:

Warning: Changing a site's ip address may cause it to appear down from some locations until the dns has propgated to all nameservers on the internet.

I don't want any downtime. The nameservers wont be changing and the IP is already on my server, is this just a general warning just in case or will I suffer downtime?

Cheers.

 

 

 

 

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