diff --git a/01.md b/01.md
index 9b868f87..3ad5d943 100644
--- a/01.md
+++ b/01.md
@@ -10,7 +10,7 @@ This NIP defines the mandatory part of the Nostr protocol. New NIPs may add new
 
 # Signed Events
 
-Events are the only data type transferred across the network. They consist in 5 main attributes: 
+Events are the only data type transferred across the network. They consist in 5 inputs and 2 calculated attributes: 
 - `pubkey` defines the signer of the event
 - `kind` defines the type of event
 - `tags` defines indexable and queryable properties of the event