Blog post for the Software Sustainability Institute. Excerpt: "For Open Science, it is important to cite the software you use in your research, as has been mentioned in previous articles on this blog. Particularly, you should cite any software that made a significant or unique impact on your work. Modern research relies heavily on computerised data analysis, and we should elevate its standing to a core research activity with data and software as prime research artefacts. Steps must be taken to preserve and cite software in a sustainable, identifiable and simple way. This is how digital repositories like Zenodo can help."