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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/15417#discussion_r520441866">bootloaders/riotboot/README.md</a>:</p>
<pre style='color:#555'>> @@ -112,3 +104,47 @@ flash` if the `riotboot` feature is used.
 ## Testing riotboot
 
 See [tests/riotboot/README.md](https://github.com/RIOT-OS/RIOT/blob/master/tests/riotboot/README.md).
+
+# Quick riotboot porting guide
+
+Your board/cpu is not supported yet? Try to port riotboot!
+
+## Porting to a board based on am Arm Cortex-M0+/3/4/7 MCU
</pre>

⬇️ Suggested change
<pre style="color: #555">-## Porting to a board based on am Arm Cortex-M0+/3/4/7 MCU
+## Porting to a board based on an Arm Cortex-M0+/3/4/7 MCU
</pre>


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