diff --git a/embassy-stm32/src/adc/ringbuffered_v2.rs b/embassy-stm32/src/adc/ringbuffered_v2.rs
index 9c114e463..3f0c1a57a 100644
--- a/embassy-stm32/src/adc/ringbuffered_v2.rs
+++ b/embassy-stm32/src/adc/ringbuffered_v2.rs
@@ -6,11 +6,13 @@ use embassy_hal_internal::{into_ref, Peripheral};
 use stm32_metapac::adc::vals::SampleTime;
 
 use crate::adc::{Adc, AdcChannel, Instance, RxDma};
-use crate::dma::ringbuffer::OverrunError;
 use crate::dma::{Priority, ReadableRingBuffer, TransferOptions};
 use crate::pac::adc::vals;
 use crate::rcc;
 
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub struct OverrunError;
+
 fn clear_interrupt_flags(r: crate::pac::adc::Adc) {
     r.sr().modify(|regs| {
         regs.set_eoc(false);
diff --git a/embassy-stm32/src/dma/ringbuffer/mod.rs b/embassy-stm32/src/dma/ringbuffer/mod.rs
index ac4be3e18..12d418414 100644
--- a/embassy-stm32/src/dma/ringbuffer/mod.rs
+++ b/embassy-stm32/src/dma/ringbuffer/mod.rs
@@ -119,7 +119,8 @@ impl<'a, W: Word> ReadableDmaRingBuffer<'a, W> {
         }
     }
 
-    /// Read elements from the ring buffer
+    /// Read elements from the ring buffer.
+    ///
     /// Return a tuple of the length read and the length remaining in the buffer
     /// If not all of the elements were read, then there will be some elements in the buffer remaining
     /// The length remaining is the capacity, ring_buf.len(), less the elements remaining after the read
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index 451f595e0..5f103e652 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -296,6 +296,9 @@ mod dual_core {
     /// It cannot be initialized by the user. The intended use is:
     ///
     /// ```
+    /// use core::mem::MaybeUninit;
+    /// use embassy_stm32::{init_secondary, SharedData};
+    ///
     /// #[link_section = ".ram_d3"]
     /// static SHARED_DATA: MaybeUninit<SharedData> = MaybeUninit::uninit();
     ///