diff --git a/52.md b/52.md
index f5bd0adb..69507441 100644
--- a/52.md
+++ b/52.md
@@ -40,7 +40,7 @@ The list of tags are as follows:
   "id": <32-bytes lowercase hex-encoded SHA-256 of the the serialized event data>,
   "pubkey": <32-bytes lowercase hex-encoded public key of the event creator>,
   "created_at": <Unix timestamp in seconds>,
-  "kind": "31922",
+  "kind": 31922,
   "content": "<description of calendar event>",
   "tags": [
     ["d", "<UUID>"],
@@ -98,7 +98,7 @@ The list of tags are as follows:
   "id": <32-bytes lowercase hex-encoded SHA-256 of the the serialized event data>,
   "pubkey": <32-bytes lowercase hex-encoded public key of the event creator>,
   "created_at": <Unix timestamp in seconds>,
-  "kind": "31923",
+  "kind": 31923,
   "content": "<description of calendar event>",
   "tags": [
     ["d", "<UUID>"],
@@ -183,7 +183,7 @@ The list of tags are as follows:
   "id": <32-bytes lowercase hex-encoded SHA-256 of the the serialized event data>,
   "pubkey": <32-bytes lowercase hex-encoded public key of the event creator>,
   "created_at": <Unix timestamp in seconds>,
-  "kind": "31925",
+  "kind": 31925,
   "content": "<note>",
   "tags": [
     ["a", "<31922 or 31923>:<calendar event author pubkey>:<d-identifier of calendar event>", "<optional relay url>"],