From c703dc6e35dffdd56358895b88887222dfb77de7 Mon Sep 17 00:00:00 2001
From: chrysn <chrysn@fsfe.org>
Date: Wed, 15 Dec 2021 15:08:33 +0100
Subject: [PATCH] sys/ztimer: Documentation clarification

---
 sys/include/ztimer.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/include/ztimer.h b/sys/include/ztimer.h
index 70a52ac1e3..ddba07fb21 100644
--- a/sys/include/ztimer.h
+++ b/sys/include/ztimer.h
@@ -365,6 +365,9 @@ struct ztimer_clock {
 
 /**
  * @brief   main ztimer callback handler
+ *
+ * This gets called by clock implementations, and must only be called by them
+ * with interrupts disabled.
  */
 void ztimer_handler(ztimer_clock_t *clock);