diff --git a/crates/matrix-sdk-crypto/src/machine.rs b/crates/matrix-sdk-crypto/src/machine.rs
index df852ca3d..8ceda3c3e 100644
--- a/crates/matrix-sdk-crypto/src/machine.rs
+++ b/crates/matrix-sdk-crypto/src/machine.rs
@@ -741,11 +741,7 @@ impl OlmMachine {
     ///
     /// # Arguments
     ///
-    /// * `sender_key` - The sender (curve25519) key of the event sender.
-    ///
-    /// * `signing_key` - The signing (ed25519) key of the event sender.
-    ///
-    /// * `event` - The decrypted to-device event.
+    /// * `decrypted` - The decrypted event and some associated metadata.
     async fn handle_decrypted_to_device_event(
         &self,
         decrypted: &OlmDecryptionInfo,
diff --git a/crates/matrix-sdk-crypto/src/olm/account.rs b/crates/matrix-sdk-crypto/src/olm/account.rs
index fb9fa5157..dd79d594b 100644
--- a/crates/matrix-sdk-crypto/src/olm/account.rs
+++ b/crates/matrix-sdk-crypto/src/olm/account.rs
@@ -90,8 +90,13 @@ impl SessionType {
     }
 }
 
+/// A struct witnessing a successful decryption of an Olm-encrypted to-device
+/// event.
+///
+/// Contains the decrypted event plaintext along with some associated metadata,
+/// such as the identity (Curve25519) key of the to-device event sender.
 #[derive(Debug, Clone)]
-pub struct OlmDecryptionInfo {
+pub(crate) struct OlmDecryptionInfo {
     pub sender: OwnedUserId,
     pub session: SessionType,
     pub message_hash: OlmMessageHash,
@@ -213,7 +218,7 @@ impl Account {
         }
     }
 
-    pub async fn decrypt_to_device_event(
+    pub(crate) async fn decrypt_to_device_event(
         &self,
         event: &ToDeviceRoomEncryptedEvent,
     ) -> OlmResult<OlmDecryptionInfo> {
@@ -1005,7 +1010,7 @@ impl ReadOnlyAccount {
     /// session failed.
     ///
     /// # Arguments
-    /// * `their_identity_key` - The other account's identitiy/curve25519 key.
+    /// * `their_identity_key` - The other account's identity/curve25519 key.
     ///
     /// * `message` - A pre-key Olm message that was sent to us by the other
     /// account.