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Co-authored-by: Kris Nuttycombe <kris@nutty.land>

zips/zip-0231.md

@@ -57,9 +57,10 @@ so the resulting decryption algorithm does not meet standard security notions
 for an authenticated encryption scheme. It is a goal of this proposal to
 rectify this, simplifying the security argument.
 
-In the light client protocol, a recipient need not download full transaction
-information if the compact transaction information indicates that they do not
-receive any memo in the transaction.
+Instead of the memo data, this ZIP proposes that it is possible to indicate whether
+a memo is present for the recipient. When using the light client protocol, a recipient
+need not download full transaction information if this indication tells them that they
+have not received any memo in the transaction.
 
 At present, it is not possible to transmit the same memo data to multiple 
 transaction recipients without redundantly encoding that data, and sending
@@ -78,7 +79,8 @@ while decreasing the amount of data that needs to be stored on-chain overall.
 - The exact number and exact lengths of distinct decryptable memos should not
   be revealed, even to the transaction recipients, although an upper bound on
   the total length of memo data that the observer does not have the capability
-  to view will be leaked.
+  to view will be leaked to transaction recipients, and the overall maximum possible length of
+  memo data will be revealed on-chain.
 - A recipient can determine whether or not they have been given the capability
   to view any memo solely by decrypting the note ciphertext.
 - Memo chunks within a transaction can be individually pruned from block storage
@@ -514,6 +516,8 @@ TBD
 
 [^stream]: [Online Authenticated-Encryption and its Nonce-Reuse Misuse-Resistance](https://eprint.iacr.org/2015/189)
 
+[^zip-0302]: [ZIP 302: Standardized Memo Field Format](zip-0302.rst)
+
 [^zip-0307]: [ZIP 307: Light Client Protocol for Payment Detection](zip-0307.rst)
 
 [^zip-0317]: [ZIP 317: Proportional Transfer Fee Mechanism](zip-0317.rst)