diff --git a/README.md b/README.md
index 5354785..181a977 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,7 @@ gitstats your-awesome-project ~/public_html
 
 The output will be generated in the given directory.
 
-If you want to use gitstats with CI to generate reports and deploy them, please see 
+If you want to use gitstats with CI to generate reports and deploy them, please see
 
 * [Use gitstats in GitHub Actions](#use-gitstats-in-github-actions)
 * [Use gitstats in Jenkins](#use-gitstats-in-jenkins)
diff --git a/pyproject.toml b/pyproject.toml
index 4c48636..1f403cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,9 +26,9 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Topic :: Software Development :: Build Tools",
-    Operating System :: Microsoft :: Windows,
-    Operating System :: POSIX :: Linux
-    Operating System :: MacOS,
+    "Operating System :: Microsoft :: Windows",
+    "Operating System :: POSIX :: Linux",
+    "Operating System :: MacOS",
 ]
 
 [project.scripts]