diff --git a/pyproject.toml b/pyproject.toml
index 187a8838..074d754b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,7 @@ classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Web Environment",
     "License :: OSI Approved :: MIT License",
+    "Operating System :: Microsoft :: Windows",
     "Operating System :: POSIX",
     "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.12",