I've been working for a small company for 1.5 years as a Software Developer. Recently the Technical Writer was let go and I was asked to take on his responsibilities on top of my current duties. Being excited and happy that they think highly of me enough to consider me for this, I accepted.
I want this added responsibility to be clear on my resume but I'm not quite sure how to do it. I know that if the responsibilities are similar enough you can just list both titles and duties together as just one entry. On the other hand, if the responsibilities are different enough then you just make two separate entries under the same company. However I feel like this situation is neither of these since my title won't change but I am doing all of the work of a Technical Writer as well as a Software Developer. Even though my title stays the same, I feel justified in thinking that I can add Technical Writer as a second title in my resume.
What is the best way to display simultaneous, non-similar job titles for the same company on a resume?
Any advice will be greatly appreciated. Thanks in advance!