Adding a pole to a bode plot of opamp?

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grizedale

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Hello,

I have a bode plot of an inverting opamp (magnitude plot).

I wish to add in a pole at 3KHz.

I know that this makes it go down with an extra gradient of the -20dB from the 3KHz point, but how mathematically do i add in this pole?, -i.e. how do i mathematically adjust the values of the bode plot to add in this pole?
 

Do you use the following product **broken link removed**
 
i believe to add a pole in you just multiply throughout by 1/ (1+jw/w0)

is this correct?
 

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