HTML Forms: Radio buttons with text fields

Question

This seems like a simple problem, but how do I create a basic HTML form that has a series of radio button options, with the last one being a text field to fill in a custom response (i.e. "Other").

What I have now:

    Reason given for stop? <br>
    <input type="radio" name="reason" value="Fit Description">Fit Description<br>
    <input type="radio" name="reason" value="Suspicious Behavior">Suspicious Behavior<br>
    <input type="radio" name="reason" value="No Reason Given">No Reason Given<br>
    <input type="radio" name="reason" value="">Other<br>

Answer 1

Just add a text input field to it.

Reason given for stop? <br>
<input type="radio" name="reason" value="Fit Description">Fit Description<br>
<input type="radio" name="reason" value="Suspicious Behavior">Suspicious Behavior<br>
<input type="radio" name="reason" value="No Reason Given">No Reason Given<br>
<input type="radio" name="reason" value="">Other <input type="text" name="other_reason" />

jsFiddle example