diff --git a/docs/aims2/errorcollection.md b/docs/aims2/errorcollection.md
index 7ed3b7db604d2ef59947716736402aa31966d639..4030b9098c2990c4b4158e59ba9d4f52b08b2c39 100644
--- a/docs/aims2/errorcollection.md
+++ b/docs/aims2/errorcollection.md
@@ -130,6 +130,21 @@ We welcome any contribution to this page.
 <td>Unknown</td>
 </tr>
 
+<td colspan="4"><b>PXE-E21: Remote Boot cancelled</b></td>
+</tr>
+<tr>
+<td><i>Where it appears</i></td>
+<td><i>Suspected reason</i></td>
+<td><i>Reference</i></td>
+<td><i>Resolution</i></td>
+</tr>
+<tr>
+<td>HNS2600KP models</td>
+<td>Old PXE client</td>
+<td>dnsmasq code: pxe_uefi_workaround @ rfc2131.c</td>
+<td>Use BIOS mode</td>
+</tr>
+
 </tbody>
 </table>
 <p>&nbsp;</p>