diff --git a/shared-bindings/analogio/AnalogIn.c b/shared-bindings/analogio/AnalogIn.c
index 2cda9355ab..328466b0d6 100644
--- a/shared-bindings/analogio/AnalogIn.c
+++ b/shared-bindings/analogio/AnalogIn.c
@@ -124,7 +124,7 @@ const mp_obj_property_t analogio_analogin_value_obj = {
               (mp_obj_t)&mp_const_none_obj},
 };
 
-//|     reference_voltage: Optional[float]
+//|     reference_voltage: float
 //|     """The maximum voltage measurable (also known as the reference voltage) as a
 //|     `float` in Volts."""
 //|
diff --git a/shared-bindings/analogio/AnalogOut.c b/shared-bindings/analogio/AnalogOut.c
index 787905c3c5..f3321a7250 100644
--- a/shared-bindings/analogio/AnalogOut.c
+++ b/shared-bindings/analogio/AnalogOut.c
@@ -42,10 +42,10 @@
 //|     Example usage::
 //|
 //|         import analogio
-//|         from microcontroller import pin
+//|         from board import *
 //|
-//|        dac = analogio.AnalogOut(pin.PA02)          # output on pin PA02
-//|         dac.value = 32768                           # makes PA02 1.65V"""
+//|         dac = analogio.AnalogOut(A2)                # output on pin A2
+//|         dac.value = 32768                           # makes A2 1.65V"""
 //|
 //|     def __init__(self, pin: microcontroller.Pin) -> None:
 //|         """Use the AnalogOut on the given pin.