I want to add a free-form option in a custom field picklist.  I found a 4 year old article that suggests the following - is this the best method? 

Add an option for "Other" and create a custom Text field (call it something like "Other description") and then add a Validation Rule (VR) like:

AND(TEXT(PicklistField) = "Other",

ISBLANK(OtherDescription))  then run a report every month of so to see what people are putting in the Other box and update the picklist with the most popular choices.

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