<p></p>
<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16228#discussion_r686142155">sys/include/net/dhcpv6/client.h</a>:</p>
<pre style='color:#555'>> + * @brief   Checks if the given network interface is configured
+ *          to use DHCPv6 IA_NA
+ *
+ * @param[in] netif     Network interface to check.
+ *
+ * @return  true, if the network interface is set up for IA_NA.
+ */
+bool dhcpv6_client_check_ia_na(unsigned netif);
+
+/**
+ * @brief   Configures a address lease that is provided by the server.
+ *
+ * @param[in] netif     Network interface the address was for.
+ * @param[in] addr      The assigned address.
+ *
+ * @return  true, if the address was configured successfully.
</pre>
<blockquote>
<p>should also be added to the documentation of dhcpv6_client_add_addr as I thought that these could be network stack specific.</p>
</blockquote>
<p>Well at least you can add to the documentation that the on error, the function shall return a negative value.</p>

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