[CentOS] 1600x900 not available

Wed Jan 10 14:43:08 UTC 2018
Sean Smith <stoc2528 at gmail.com>

My laptop is a Dell XPS-13 running CentOS 7.  It has a 13" 1920x1080 
screen and it's a bit difficult for my mid-40s eyesight.  Fedora and 
Debian, on this laptop, give me the option of choosing 1600x900 which is 
much easier for me to read but CentOS doesn't show this resolution as 

I followed the steps I found in a post on stackexchange using xrandr, 
substituting 1600x900 where applicable and it worked but, once I 
rebooted, it went back to 1920x1080 with no 1600x900 option in 

Is there a way I can add 1600x900 resolution the list of available 
resolutions in settings-display?