diff --git a/stdlib/3/io.pyi b/stdlib/3/io.pyi
index 9d9351177..c068d2cb2 100644
--- a/stdlib/3/io.pyi
+++ b/stdlib/3/io.pyi
@@ -1,5 +1,3 @@
-# Stubs for io
-
 from typing import (
     List, BinaryIO, TextIO, Iterator, Union, Optional, Callable, Tuple, Any, IO, Iterable
 )
@@ -251,4 +249,5 @@ class StringIO(TextIOWrapper):
     def getvalue(self) -> str: ...
     def __enter__(self) -> 'StringIO': ...
 
-class IncrementalNewlineDecoder(codecs.IncrementalDecoder): ...
+class IncrementalNewlineDecoder(codecs.IncrementalDecoder):
+    def decode(self, input: codecs._encoded, final: bool = ...) -> codecs._decoded: ...