diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 0bb0c89f92..9e580b570a 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -3435,7 +3435,7 @@ class OSErrorTests(unittest.TestCase):
 
         self.filenames = self.bytes_filenames + self.unicode_filenames
 
-    # TODO: RUSTPYTHON (AttributeError: 'FileNotFoundError' object has no attribute 'filename')
+    # TODO: RUSTPYTHON (AssertionError: b'@test_22106_tmp\xe7w\xf0' is not b'@test_22106_tmp\xe7w\xf0' : <built-in function chdir>)
     @unittest.expectedFailure
     def test_oserror_filename(self):
         funcs = [
diff --git a/vm/src/stdlib/os.rs b/vm/src/stdlib/os.rs
index ae956230fa..82bd69873f 100644
--- a/vm/src/stdlib/os.rs
+++ b/vm/src/stdlib/os.rs
@@ -265,6 +265,8 @@ impl IntoPyException for nix::Error {
         io::Error::from(self).into_pyexception(vm)
     }
 }
+
+// TODO: preserve the input `PyObjectRef` of filename and filename2 (Failing check `self.assertIs(err.filename, name, str(func)`)
 pub struct IOErrorBuilder {
     error: io::Error,
     filename: Option<PathOrFd>,