diff --git a/704.md b/704.md
index f2a91e9..51c5d7c 100644
--- a/704.md
+++ b/704.md
@@ -68,7 +68,7 @@ If `Alice` wants to signal `Bob` that she is ready to use this NIP (for more pri
   "receive_index": <integer (optional), the index of the last key an event was received to>,
  }
  ```
-  > **Note** `send_index` and `receive_index` are optional, but they help the client a lot in knowing what the state is. Alternatively (when an account is retored) the client would have to scan the public keys until unused ones are found.
+  > **Note** `send_index` and `receive_index` are optional, but they help the client a lot in knowing what the state is. Alternatively (when an account is retored) the client would have to scan the public keys until unused ones are found (similar to [BIP-44 address gap logic](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#user-content-Address_gap_limit)).
  
  - publish a `Parameterized Replaceable Event` ([NIP-33](https://github.com/nostr-protocol/nips/blob/master/33.md)) having: