diff --git a/src/definitions/transaction_type.rs b/src/definitions/transaction_type.rs
index e5bea3eb3..6ec79919f 100644
--- a/src/definitions/transaction_type.rs
+++ b/src/definitions/transaction_type.rs
@@ -1,3 +1,6 @@
+/// TransactionType is an enum that represents the type of transaction.
+///
+/// It is used in the transaction header and in the transaction execution info.
 #[derive(Debug, PartialEq, Copy, Clone, Eq, Hash)]
 pub enum TransactionType {
     Declare,
@@ -9,6 +12,7 @@ pub enum TransactionType {
 }
 
 impl From<TransactionType> for u64 {
+    /// Converts a [TransactionType] into a [u64].
     fn from(tx_type: TransactionType) -> Self {
         match tx_type {
             TransactionType::Declare => 0,