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Adding a description field from a picklist field

I have a field in SF which is a picklist field.  I am trying to create another field in SF that when a certain item in the picklist is selected the additional field will display a description of the selected item.  I am trying to write a formula for the field that is displaying the description but SF tells me that I cannot create a formula field that runs from a picklist.  Is there a work around that will allow a description to be added in another field?