  Software engineers have a wide variety of tools and techniques that can help
them improve the quality of their code, but still, a lot of bugs remain
undetected. In this paper we build on the idea that if a particular fragment of
code is changed too often, it could be caused by some technical or
architectural issues, therefore, this fragment requires additional attention
from developers. Most teams nowadays use version control systems to track
changes in their code and organize cooperation between developers. We propose
to use data from version control systems to track the number of changes for
each method in a project for a selected time period and display this
information within the IDE's code editor. The paper describes such a tool
called Topias built as a plugin for IntelliJ IDEA. Its source code is available
at https://github.com/JetBrains-Research/topias. A demonstration video can be
found at https://www.youtube.com/watch?v=xsqc4gCTxfA.
