align HasFileno protocol with asyncvarlink

1 files changed, 7 insertions, 1 deletions

diff --git a/linuxnamespaces/filedescriptor.py b/linuxnamespaces/filedescriptor.py
index f9460bf..ee96a94 100644
--- a/linuxnamespaces/filedescriptor.py
+++ b/linuxnamespaces/filedescriptor.py
@@ -8,9 +8,15 @@ import os
 import typing
 
 
+# pylint: disable=too-few-public-methods  # It's that one method we describe.
 @typing.runtime_checkable
 class HasFileno(typing.Protocol):
-    def fileno(self) -> int: ...
+    """A typing protocol representing a file-like object and looking up the
+    underlying file descriptor.
+    """
+
+    def fileno(self) -> int:
+        """Return the underlying file descriptor."""
 
 
 FileDescriptorLike = int | HasFileno