diff --git a/stdlib/3/io.pyi b/stdlib/3/io.pyi
index 54dfc1e07..206f9345e 100644
--- a/stdlib/3/io.pyi
+++ b/stdlib/3/io.pyi
@@ -73,6 +73,8 @@ class FileIO(RawIOBase, BinaryIO):
         closefd: bool = ...,
         opener: Optional[Callable[[Union[int, str], str], int]] = ...,
     ) -> None: ...
+    @property
+    def closefd(self) -> bool: ...
     def write(self, __b: ReadableBuffer) -> int: ...
     def read(self, __size: int = ...) -> bytes: ...
     def __enter__(self: _T) -> _T: ...
@@ -116,6 +118,7 @@ class BufferedRandom(BufferedReader, BufferedWriter):
 
 class BufferedRWPair(BufferedIOBase):
     def __init__(self, reader: RawIOBase, writer: RawIOBase, buffer_size: int = ...) -> None: ...
+    def peek(self, __size: int = ...) -> bytes: ...
 
 class TextIOBase(IOBase):
     encoding: str
@@ -132,7 +135,6 @@ class TextIOBase(IOBase):
     def tell(self) -> int: ...
 
 class TextIOWrapper(TextIOBase, TextIO):
-    line_buffering: bool
     def __init__(
         self,
         buffer: IO[bytes],
@@ -144,7 +146,13 @@ class TextIOWrapper(TextIOBase, TextIO):
     ) -> None: ...
     @property
     def buffer(self) -> BinaryIO: ...
+    @property
+    def closed(self) -> bool: ...
+    @property
+    def line_buffering(self) -> bool: ...
     if sys.version_info >= (3, 7):
+        @property
+        def write_through(self) -> bool: ...
         def reconfigure(
             self,
             *,
@@ -154,7 +162,6 @@ class TextIOWrapper(TextIOBase, TextIO):
             line_buffering: Optional[bool] = ...,
             write_through: Optional[bool] = ...,
         ) -> None: ...
-    closed: bool
     # These are inherited from TextIOBase, but must exist in the stub to satisfy mypy.
     def __enter__(self: _T) -> _T: ...
     def __iter__(self) -> Iterator[str]: ...  # type: ignore
@@ -175,3 +182,5 @@ class StringIO(TextIOWrapper):
 class IncrementalNewlineDecoder(codecs.IncrementalDecoder):
     def __init__(self, decoder: Optional[codecs.IncrementalDecoder], translate: bool, errors: str = ...) -> None: ...
     def decode(self, input: Union[bytes, str], final: bool = ...) -> str: ...
+    @property
+    def newlines(self) -> Optional[Union[str, Tuple[str, ...]]]: ...