Generally, to minor in any area, you need to take several classes in that area. So you need to be prepared to study (and or practice) two different areas.
Be sure to speak to an advisor or counselor at your school to learn whether there are any specific requirements for earning a minor. I had to write a paper explaining how my minor related to my major and how I would use the knowledge gained in my career. But to my understanding, such a requirement is not typical.