From d81c3758d5633c22342cb60069243243f9d38df5 Mon Sep 17 00:00:00 2001
From: Robin Mueller <31589589+robamu@users.noreply.github.com>
Date: Wed, 18 Sep 2024 15:14:28 +0200
Subject: [PATCH] update docs (#977)

Add notice for systems without native CAS operations
---
 rtic-monotonics/src/lib.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rtic-monotonics/src/lib.rs b/rtic-monotonics/src/lib.rs
index 70a89fc90d..9245f4539b 100644
--- a/rtic-monotonics/src/lib.rs
+++ b/rtic-monotonics/src/lib.rs
@@ -1,6 +1,11 @@
 //! In-tree implementations of the [`rtic_time::Monotonic`] (reexported) trait for
 //! timers & clocks found on commonly used microcontrollers.
 //!
+//! If you are using a microcontroller where CAS operations are not available natively, you might
+//! have to enable the `critical-section` or `unsafe-assume-single-core` feature of the
+//! [`portable-atomic`](https://docs.rs/portable-atomic/latest/portable_atomic/) dependency
+//! yourself for this dependency to compile.
+//!
 //! To enable the implementations, you must enable a feature for the specific MCU you're targeting.
 //!
 //! # Cortex-M Systick