<p></p>
<p><b>@kaspar030</b> requested changes on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16507#discussion_r642972561">sys/event/periodic_timeout.c</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2021 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
</pre>
<p>author block missing</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16507#discussion_r642987590">sys/include/event/timeout.h</a>:</p>
<pre style='color:#555'>> @@ -115,6 +129,55 @@ void event_timeout_set(event_timeout_t *event_timeout, uint32_t timeout);
  */
 void event_timeout_clear(event_timeout_t *event_timeout);
 
+#if IS_USED(MODULE_EVENT_PERIODIC_TIMEOUT)
</pre>
<p>this should have <code>|| doxygen</code>.</p>
<p>(I think I missed that for event_timeout_ztimer)</p>

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