diff --git a/61.md b/61.md
index d46b1549..33442a3b 100644
--- a/61.md
+++ b/61.md
@@ -46,7 +46,8 @@ Clients MUST prefix the pubkey they p2pk-lock with `"02"` (for nostr<>cashu pubk
     content: "Thanks for this great idea.",
     pubkey: "sender-pubkey",
     tags: [
-        [ "amount", "1", "sat" ],
+        [ "amount", "1" ],
+        [ "unit", "sat" ],
         [ "proof", "{\"amount\":1,\"C\":\"02277c66191736eb72fce9d975d08e3191f8f96afb73ab1eec37e4465683066d3f\",\"id\":\"000a93d6f8a1d2c4\",\"secret\":\"[\\\"P2PK\\\",{\\\"nonce\\\":\\\"b00bdd0467b0090a25bdf2d2f0d45ac4e355c482c1418350f273a04fedaaee83\\\",\\\"data\\\":\\\"02eaee8939e3565e48cc62967e2fde9d8e2a4b3ec0081f29eceff5c64ef10ac1ed\\\"}]\"}" ],
         [ "u", "https://stablenut.umint.cash", ],
         [ "e", "<zapped-event-id>", "<relay-hint>" ],
@@ -57,6 +58,7 @@ Clients MUST prefix the pubkey they p2pk-lock with `"02"` (for nostr<>cashu pubk
 
 * `.content` is an optional comment for the nutzap
 * `amount` is a shorthand for the combined amount of all outputs. -- Clients SHOULD validate that the sum of the amounts in the outputs matches.
+* `unit` is the base unit of the amount.
 * `proof` is one ore more proofs p2pk-locked to the pubkey the recipient specified in their `kind:10019` event.
 * `u` is the mint the URL of the mint EXACTLY as specified by the recipient's `kind:10019`.
 * `e` zero or one event that is being nutzapped.