diff --git a/stmhal/dac.c b/stmhal/dac.c
index e8ed752c06b88..e279c6d63a04a 100644
--- a/stmhal/dac.c
+++ b/stmhal/dac.c
@@ -50,7 +50,7 @@
/// from pyb import DAC
///
/// dac = DAC(1) # create DAC 1 on pin X5
-/// dac.write(128) # write a value to the DAC (makes X5 1.65V)
+/// dac.write(2048) # write a value to the DAC (makes X5 1.65V)
///
/// To output a continuous sine-wave:
///
@@ -223,7 +223,7 @@ STATIC mp_obj_t pyb_dac_triangle(mp_obj_t self_in, mp_obj_t freq) {
STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_dac_triangle_obj, pyb_dac_triangle);
/// \method write(value)
-/// Direct access to the DAC output (8 bit only at the moment).
+/// Direct access to the DAC output (12 bit only at the moment).
STATIC mp_obj_t pyb_dac_write(mp_obj_t self_in, mp_obj_t val) {
pyb_dac_obj_t *self = self_in;
@@ -235,7 +235,7 @@ STATIC mp_obj_t pyb_dac_write(mp_obj_t self_in, mp_obj_t val) {
self->state = 1;
}
- HAL_DAC_SetValue(&DAC_Handle, self->dac_channel, DAC_ALIGN_8B_R, mp_obj_get_int(val));
+ HAL_DAC_SetValue(&DAC_Handle, self->dac_channel, DAC_ALIGN_12B_R, mp_obj_get_int(val));
HAL_DAC_Start(&DAC_Handle, self->dac_channel);
return mp_const_none;
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