diff --git a/draft-ietf-sidrops-8210bis.xml b/draft-ietf-sidrops-8210bis.xml
index d45dd7f..e62b382 100644
--- a/draft-ietf-sidrops-8210bis.xml
+++ b/draft-ietf-sidrops-8210bis.xml
@@ -1010,7 +1010,9 @@
         </t>
         <t>
           If the entire erroneous PDU will not fit in the Erroneous PDU
-          field, it MUST be truncated.
+          field, it MUST be truncated.  At a minimum, the first four
+          octets MUST be included.  Beware any attempts to parse an
+          Erroneous PDU.
         </t>
         <t>
           The Arbitrary Text field is optional; if not present, the