diff --git a/01.md b/01.md
index d040666c..38ba2904 100644
--- a/01.md
+++ b/01.md
@@ -16,8 +16,8 @@ The only object type that exists is the `event`, which has the following format
 
 ```json
 {
-  "id": <32-bytes sha256 of the the serialized event data>
-  "pubkey": <32-bytes hex-encoded public key of the event creator>,
+  "id": <32-bytes lowercase hex-encoded sha256 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": <integer>,
   "tags": [