  Release planning for mobile apps has recently become an area of active
research. Prior research in this area concentrated on the analysis of release
notes and on tracking user reviews to support app evolution with issue
trackers. However, little is known about the impact of user reviews on the
evolution of mobile apps. Our work explores the role of user reviews in app
updates based on release notes. For this purpose, we collected user reviews and
release notes of Spotify, the 'number one' app in the 'Music' category in Apple
App Store, as the research data. Then, we manually removed non-informative
parts of each release note, and manually determined the relevance of the app
reviews with respect to the release notes. We did this by using Word2Vec
calculation techniques based on the top 80 app release notes with the highest
similarities. Our empirical results show that more than 60% of the matched
reviews are actually irrelevant to the corresponding release notes. When
zooming in at these relevant user reviews, we found that around half of them
were posted before the new release and referred to requests, suggestions, and
complaints. Whereas, the other half of the relevant user reviews were posted
after updating the apps and concentrated more on bug reports and praise.
