Add chins or switch to Onus Wunsler?

[Draco]

Mr. Rippetoe,
I really like the orthodox Starting Strength routine, but I was thinking of doing the Onus Wunsler routine because it includes chins. Sounds silly, but I just don't want to add anything to what you've prescribed. However, if you could just tell me it's okay to add those 3 sets of Chins to the "B" day on the regular SS routine...

[Mark Rippetoe]

It's okay, my child.