diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py
index 37a18c351..e63e6c383 100644
--- a/sphinx/environment/__init__.py
+++ b/sphinx/environment/__init__.py
@@ -598,7 +598,7 @@ class BuildEnvironment:
             docname = self.docname
         self.dependencies[docname].add(os.fspath(filename))
 
-    def note_included(self, filename: str) -> None:
+    def note_included(self, filename: str | os.PathLike[str]) -> None:
         """Add *filename* as a included from other document.
 
         This means the document is not orphaned.