diff --git a/src/ros_license_toolkit/checks.py b/src/ros_license_toolkit/checks.py
index 9bff7d2..1c542e9 100644
--- a/src/ros_license_toolkit/checks.py
+++ b/src/ros_license_toolkit/checks.py
@@ -103,4 +103,4 @@ def check(self, package: Package):
 
     def _check(self, package: Package):
         """Check `package`. To be overwritten by subclasses."""
-        raise NotImplementedError("Overwrite this")
\ No newline at end of file
+        raise NotImplementedError("Overwrite this")