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

<p>doxygen nitpick, looks good otherwise</p><hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16330#discussion_r613265477">core/include/clist.h</a>:</p>
<pre style='color:#555'>> @@ -466,6 +468,38 @@ static inline size_t clist_count(clist_node_t *list)
     return cnt;
 }
 
+/**
+ * @brief   Tells if a list has exactly one element
+ *
+ * @note    Complexity: O(1)
+ *
+ * @param[in]   list    Pointer to the clist
+ *
+ * @return      Cardinality == 1 information
</pre>
<p>here and below: please drop the "<a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/return/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/return">@return</a>", and rename "<a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/RetVal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/RetVal">@RetVal</a>" to "<a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/returns/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/returns">@returns</a>".</p>
<p>The former because IMO, return and retval are redundant.<br>
The latter because the rest of the file uses <code>@returns</code>, and if we want to fix that, we should do all in one go and until then keep it consistent.</p>

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