diff --git a/shared-bindings/hashlib/__init__.c b/shared-bindings/hashlib/__init__.c
index 4b5be0165b..d5efa21361 100644
--- a/shared-bindings/hashlib/__init__.c
+++ b/shared-bindings/hashlib/__init__.c
@@ -38,7 +38,7 @@
 //| |see_cpython_module| :mod:`cpython:hashlib`.
 //| """
 //|
-//| def new(name, data=b"") -> hashlib.Hash:
+//| def new(name: str, data: bytes=b"") -> hashlib.Hash:
 //|     """Returns a Hash object setup for the named algorithm. Raises ValueError when the named
 //|        algorithm is unsupported.
 //|
diff --git a/shared-bindings/usb/core/Device.c b/shared-bindings/usb/core/Device.c
index 2ade459d5f..bf4df6b88b 100644
--- a/shared-bindings/usb/core/Device.c
+++ b/shared-bindings/usb/core/Device.c
@@ -130,7 +130,7 @@ MP_DEFINE_CONST_FUN_OBJ_1(usb_core_device_get_manufacturer_obj, usb_core_device_
 MP_PROPERTY_GETTER(usb_core_device_manufacturer_obj,
     (mp_obj_t)&usb_core_device_get_manufacturer_obj);
 
-//|     def write(self, endpoint: int, data: ReadableBuffer, timeout = None) -> int:
+//|     def write(self, endpoint: int, data: ReadableBuffer, timeout:Optional[int] = None) -> int:
 //|         """Write data to a specific endpoint on the device.
 //|
 //|            :param int endpoint: the bEndpointAddress you want to communicate with.
@@ -159,7 +159,7 @@ STATIC mp_obj_t usb_core_device_write(size_t n_args, const mp_obj_t *pos_args, m
 MP_DEFINE_CONST_FUN_OBJ_KW(usb_core_device_write_obj, 2, usb_core_device_write);
 
 
-//|     def read(self, endpoint: int, size_or_buffer: array.array, timeout = None) -> int:
+//|     def read(self, endpoint: int, size_or_buffer: array.array, timeout:Optional[int] = None) -> int:
 //|         """Read data from the endpoint.
 //|
 //|            :param int endpoint: the bEndpointAddress you want to communicate with.
@@ -186,8 +186,8 @@ STATIC mp_obj_t usb_core_device_read(size_t n_args, const mp_obj_t *pos_args, mp
 }
 MP_DEFINE_CONST_FUN_OBJ_KW(usb_core_device_read_obj, 2, usb_core_device_read);
 
-//|     def ctrl_transfer(self, bmRequestType, bRequest, wValue=0, wIndex=0,
-//|                       data_or_wLength: Optional[array.array] = None, timeout = None) -> int:
+//|     def ctrl_transfer(self, bmRequestType:int, bRequest:int, wValue:int=0, wIndex:int=0,
+//|                       data_or_wLength: Optional[array.array] = None, timeout:Optional[int] = None) -> int:
 //|         """Do a control transfer on the endpoint 0. The parameters bmRequestType,
 //|            bRequest, wValue and wIndex are the same of the USB Standard Control
 //|            Request format.
@@ -254,7 +254,7 @@ STATIC mp_obj_t usb_core_device_is_kernel_driver_active(mp_obj_t self_in, mp_obj
 }
 MP_DEFINE_CONST_FUN_OBJ_2(usb_core_device_is_kernel_driver_active_obj, usb_core_device_is_kernel_driver_active);
 
-//|     def detach_kernel_driver(self, interface: int):
+//|     def detach_kernel_driver(self, interface: int) -> None:
 //|         """Stop CircuitPython from using the interface. If successful, you
 //|            will then be able to perform I/O. CircuitPython will automatically
 //|            re-start using the interface on reload.
@@ -271,7 +271,7 @@ STATIC mp_obj_t usb_core_device_detach_kernel_driver(mp_obj_t self_in, mp_obj_t
 }
 MP_DEFINE_CONST_FUN_OBJ_2(usb_core_device_detach_kernel_driver_obj, usb_core_device_detach_kernel_driver);
 
-//|     def attach_kernel_driver(self, interface: int):
+//|     def attach_kernel_driver(self, interface: int) -> None:
 //|         """Allow CircuitPython to use the interface if it wants to.
 //|
 //|            :param int interface: the device interface number to allow CircuitPython to use
diff --git a/shared-bindings/usb/core/__init__.c b/shared-bindings/usb/core/__init__.c
index 0e0d409ede..a5de83f784 100644
--- a/shared-bindings/usb/core/__init__.c
+++ b/shared-bindings/usb/core/__init__.c
@@ -64,7 +64,7 @@ NORETURN void mp_raise_usb_core_USBTimeoutError(void) {
 }
 
 
-//| def find(find_all=False, *, idVendor=None, idProduct=None):
+//| def find(find_all:bool=False, *, idVendor:Optional[int]=None, idProduct:Optional[int]=None) -> Device:
 //|    """Find the first device that matches the given requirements or, if
 //|       find_all is True, return a generator of all matching devices.
 //|