diff --git a/0027-interledger-protocol-4/0027-interledger-protocol-4.md b/0027-interledger-protocol-4/0027-interledger-protocol-4.md
index 63a7de78..150cbdef 100644
--- a/0027-interledger-protocol-4/0027-interledger-protocol-4.md
+++ b/0027-interledger-protocol-4/0027-interledger-protocol-4.md
@@ -1,6 +1,6 @@
 ---
 title: Interledger Protocol V4 (ILPv4)
-draft: 6
+draft: 7
 ---
 
 # Interledger Protocol V4
@@ -94,7 +94,7 @@ In the case of post-funded accounts, senders transfer value to their connector a
 
 ### Packet Format
 
-ILPv4 packets SHOULD be encoded using the ASN.1 Octet Encoding Rules.
+ILPv4 packets MUST be encoded using the ASN.1 Canonical Octet Encoding Rules. Implementations MAY accept packets encoded in a non-canonical form.
 
 #### Type-Length Wrapper