Remove "NIP-33" (#896)

1 files changed, 2 insertions, 2 deletions

diff --git a/57.md b/57.md
index 2b2c97b..759e203 100644
--- a/57.md
+++ b/57.md
@@ -36,7 +36,7 @@ A `zap request` is an event of kind `9734` that is _not_ published to relays, bu
 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 NIP-33 event coordinate that allows tipping parameterized replaceable events such as NIP-23 long-form notes.
+- `a` is an optional event coordinate that allows tipping parameterized replaceable events such as NIP-23 long-form notes.
 
 Example:
 
@@ -110,7 +110,7 @@ When a client sends a `zap request` event to a server's lnurl-pay callback URL,
 4. It MUST have 0 or 1 `e` tags
 5. There should be a `relays` tag with the relays to send the `zap receipt` to.
 6. If there is an `amount` tag, it MUST be equal to the `amount` query parameter.
-7. If there is an `a` tag, it MUST be a valid NIP-33 event coordinate
+7. If there is an `a` tag, it MUST be a valid event coordinate
 
 The event MUST then be stored for use later, when the invoice is paid.