diff --git a/03.md b/03.md
index 74e010cb..3cd40a07 100644
--- a/03.md
+++ b/03.md
@@ -12,8 +12,8 @@ This NIP defines an event with `kind:1040` that can contain an [OpenTimestamps](
 {
   "kind": 1040
   "tags": [
-    ["e", <event-id>, <relay-url>],
-    ["alt", "opentimestamps attestation"]
+    ["e", <target-event-id>, <relay-url>],
+    ["k", "<target-event-kind>"]
   ],
   "content": <base64-encoded OTS file data>
 }
diff --git a/18.md b/18.md
index 5d55f84c..4bea80a0 100644
--- a/18.md
+++ b/18.md
@@ -40,6 +40,5 @@ Since `kind 6` reposts are reserved for `kind 1` contents, we use `kind 16`
 as a "generic repost", that can include any kind of event inside other than
 `kind 1`.
 
-`kind 16` reposts SHOULD contain a `k` tag with the stringified kind number
+`kind 16` reposts SHOULD contain a `"k"` tag with the stringified kind number
 of the reposted event as its value.
-
diff --git a/57.md b/57.md
index c37126e8..474f0920 100644
--- a/57.md
+++ b/57.md
@@ -37,6 +37,7 @@ In addition, the event MAY include the following tags:
 
 - `e` is an optional hex-encoded event id. Clients MUST include this if zapping an event rather than a person.
 - `a` is an optional event coordinate that allows tipping addressable events such as NIP-23 long-form notes.
+- `k` is the stringified kind of the target event.
 
 Example:
 
@@ -49,7 +50,8 @@ Example:
     ["amount", "21000"],
     ["lnurl", "lnurl1dp68gurn8ghj7um5v93kketj9ehx2amn9uh8wetvdskkkmn0wahz7mrww4excup0dajx2mrv92x9xp"],
     ["p", "04c915daefee38317fa734444acee390a8269fe5810b2241e5e6dd343dfbecc9"],
-    ["e", "9ae37aa68f48645127299e9453eb5d908a0cbb6058ff340d528ed4d37c8994fb"]
+    ["e", "9ae37aa68f48645127299e9453eb5d908a0cbb6058ff340d528ed4d37c8994fb"],
+    ["k", "1"]
   ],
   "pubkey": "97c70a44366a6535c145b333f973ea86dfdc2d7a99da618c40c64705ad98e322",
   "created_at": 1679673265,
@@ -151,6 +153,7 @@ Example `zap receipt`:
       ["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"],
       ["P", "97c70a44366a6535c145b333f973ea86dfdc2d7a99da618c40c64705ad98e322"],
       ["e", "3624762a1274dd9636e0c552b53086d70bc88c165bc4dc0f9e836a1eaf86c3b8"],
+      ["k", "1"],
       ["bolt11", "lnbc10u1p3unwfusp5t9r3yymhpfqculx78u027lxspgxcr2n2987mx2j55nnfs95nxnzqpp5jmrh92pfld78spqs78v9euf2385t83uvpwk9ldrlvf6ch7tpascqhp5zvkrmemgth3tufcvflmzjzfvjt023nazlhljz2n9hattj4f8jq8qxqyjw5qcqpjrzjqtc4fc44feggv7065fqe5m4ytjarg3repr5j9el35xhmtfexc42yczarjuqqfzqqqqqqqqlgqqqqqqgq9q9qxpqysgq079nkq507a5tw7xgttmj4u990j7wfggtrasah5gd4ywfr2pjcn29383tphp4t48gquelz9z78p4cq7ml3nrrphw5w6eckhjwmhezhnqpy6gyf0"],
       ["description", "{\"pubkey\":\"97c70a44366a6535c145b333f973ea86dfdc2d7a99da618c40c64705ad98e322\",\"content\":\"\",\"id\":\"d9cc14d50fcb8c27539aacf776882942c1a11ea4472f8cdec1dea82fab66279d\",\"created_at\":1674164539,\"sig\":\"77127f636577e9029276be060332ea565deaf89ff215a494ccff16ae3f757065e2bc59b2e8c113dd407917a010b3abd36c8d7ad84c0e3ab7dab3a0b0caa9835d\",\"kind\":9734,\"tags\":[[\"e\",\"3624762a1274dd9636e0c552b53086d70bc88c165bc4dc0f9e836a1eaf86c3b8\"],[\"p\",\"32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245\"],[\"relays\",\"wss://relay.damus.io\",\"wss://nostr-relay.wlvs.space\",\"wss://nostr.fmt.wiz.biz\",\"wss://relay.nostr.bg\",\"wss://nostr.oxtr.dev\",\"wss://nostr.v0l.io\",\"wss://brb.io\",\"wss://nostr.bitcoiner.social\",\"ws://monad.jb55.com:8080\",\"wss://relay.snort.social\"]]}"],
       ["preimage", "5d006d2cf1e73c7148e7519a4c68adc81642ce0e25a432b2434c99f97344c15f"]
diff --git a/61.md b/61.md
index ebb8af3e..fcfc59b2 100644
--- a/61.md
+++ b/61.md
@@ -53,6 +53,7 @@ Clients MUST prefix the public key they P2PK-lock with `"02"` (for nostr<>cashu
         [ "proof", "{\"amount\":1,\"C\":\"02277c66191736eb72fce9d975d08e3191f8f96afb73ab1eec37e4465683066d3f\",\"id\":\"000a93d6f8a1d2c4\",\"secret\":\"[\\\"P2PK\\\",{\\\"nonce\\\":\\\"b00bdd0467b0090a25bdf2d2f0d45ac4e355c482c1418350f273a04fedaaee83\\\",\\\"data\\\":\\\"02eaee8939e3565e48cc62967e2fde9d8e2a4b3ec0081f29eceff5c64ef10ac1ed\\\"}]\"}" ],
         [ "u", "https://stablenut.umint.cash" ],
         [ "e", "<nutzapped-event-id>", "<relay-hint>" ],
+        [ "k", "<nutzapped-kind>"],
         [ "p", "e9fbced3a42dcf551486650cc752ab354347dd413b307484e4fd1818ab53f991" ], // recipient of nutzap
     ]
 }