1 files changed, 10 insertions, 2 deletions

diff --git a/52.md b/52.md
index 97873ef..bedf613 100644
--- a/52.md
+++ b/52.md
@@ -187,6 +187,10 @@ This NIP is intentionally not defining who is authorized to attend a calendar ev
 
 This NIP is also intentionally not defining what happens if a calendar event changes after an RSVP is submitted.
 
+The RSVP MUST have an `a` tag of the event coordinates to the calendar event, and optionally an `e` tag of the id of the specific calendar event revision. If an `e` tag is present, clients SHOULD interpret it as an indication that the RSVP is a response to that revision of the calendar event, and MAY interpret it to not necessarily apply to other revisions of the calendar event.
+
+The RSVP MAY tag the author of the calendar event it is in response to using a `p` tag so that clients can easily query all RSVPs that pertain to the author.
+
 ### Format
 
 The format uses a parameterized replaceable event kind `31925`.
@@ -194,10 +198,12 @@ The format uses a parameterized replaceable event kind `31925`.
 The `.content` of these events is optional and should be a free-form note that adds more context to this calendar event response.
 
 The list of tags are as follows:
-* `a` (required) reference tag to kind `31922` or `31923` calendar event being responded to.
+* `a` (required) coordinates to a kind `31922` or `31923` calendar event being responded to.
+* `e` (optional) event id of a kind `31922` or `31923` calendar event being responded to.
 * `d` (required) universally unique identifier. Generated by the client creating the calendar event RSVP.
 * `status` (required) `accepted`, `declined`, or `tentative`. Determines attendance status to the referenced calendar event.
 * `fb` (optional) `free` or `busy`. Determines if the user would be free or busy for the duration of the calendar event. This tag must be omitted or ignored if the `status` label is set to `declined`.
+* `p` (optional) pubkey of the author of the calendar event being responded to.
 
 ```json
 {
@@ -207,10 +213,12 @@ The list of tags are as follows:
   "kind": 31925,
   "content": "<note>",
   "tags": [
-    ["a", "<31922 or 31923>:<calendar event author pubkey>:<d-identifier of calendar event>", "<optional relay url>"],
+    ["e", "<kind 31922 or 31923 event id", "<optional recommended relay URL>"]
+    ["a", "<31922 or 31923>:<calendar event author pubkey>:<d-identifier of calendar event>", "<optional recommended relay URL>"],
     ["d", "<UUID>"],
     ["status", "<accepted/declined/tentative>"],
     ["fb", "<free/busy>"],
+    ["p", "<hex pubkey of kind 31922 or 31923 event>", "<optional recommended relay URL>"]
   ]
 }
 ```