update Compatibility section

Author: hugohn

bip-hugonguyen-bsms.mediawiki

@@ -2,7 +2,11 @@
   BIP: To be determined
   Layer: Applications
   Title: Bitcoin Secure Multisig Setup (BSMS)
-  Author: Hugo Nguyen <hugo at nunchuk.io>, Peter Gray <peter at coinkite.com>, Marko Bencun <marko at shiftcrypto.ch>, Aaron Chen <aarondongchen at gmail.com>, Rodolfo Novak <rodolfo at coinkite.com>
+  Author: Hugo Nguyen <hugo at nunchuk.io>
+          Peter Gray <peter at coinkite.com>
+          Marko Bencun <marko at shiftcrypto.ch>
+          Aaron Chen <aarondongchen at gmail.com>
+          Rodolfo Novak <rodolfo at coinkite.com>
   Comments-Summary: No comments yet.
   Comments-URI:
   Status: Proposed
@@ -183,6 +187,8 @@ Also refer to [https://github.com/BlockchainCommons/Research/blob/master/papers/
 ==Compatibility==
 To comply with this standard, a Signer must be able to persist the descriptor record in its storage. 
 
+Existing multisig wallets should delay upgrading to the BSMS scheme until all participating Signers in the multisig wallet have added support for BSMS.
+
 ==Security==
 
 This proposal introduces two layers of protection. The first one is a temporary, secret <tt>TOKEN</tt>. The second one is the confirmation of the wallet's first address.