diff --git a/project-guidelines.md b/project-guidelines.md
index 852ae7d..212f61c 100644
--- a/project-guidelines.md
+++ b/project-guidelines.md
@@ -44,6 +44,7 @@ Comments, strings, variable names, class names, docstrings, as well as all other
 ## Code Style
 All the Python code should follow the [PEP 8 guidelines](https://www.python.org/dev/peps/pep-0008/), with the following differences:
 + Variable and function names must be camelCase, and must fully consist of either full words or common/understandable abbreviations.
++ Use f-strings when applicable.
 
 ### Documentation
 + Comment lines should not exede 72 characters.