style: clang-tidy: llvm-namespace-comment
diff --git a/tests/test_stl.cpp b/tests/test_stl.cpp
index b230717..0590162 100644
--- a/tests/test_stl.cpp
+++ b/tests/test_stl.cpp
@@ -47,7 +47,7 @@
 namespace std {
     template <>
     struct hash<TplCtorClass> { size_t operator()(const TplCtorClass &) const { return 0; } };
-}
+} // namespace std
 
 
 template <template <typename> class OptionalImpl, typename T>