diff --git a/lib/src/omemo/sessionmanager.dart b/lib/src/omemo/sessionmanager.dart
index 9419284..6035a7c 100644
--- a/lib/src/omemo/sessionmanager.dart
+++ b/lib/src/omemo/sessionmanager.dart
@@ -35,6 +35,8 @@ class EncryptionResult {
   final List<EncryptedKey> encryptedKeys;
 }
 
+/// EncryptedKey is the intermediary format of a <key /> element in the OMEMO message's
+/// <keys /> header.
 @immutable
 class EncryptedKey {