diff --git a/src/Core/KeyManagement/Models/Api/Response/MasterPasswordUnlockResponseModel.cs b/src/Core/KeyManagement/Models/Api/Response/MasterPasswordUnlockResponseModel.cs
index f54e88c596..eebed83485 100644
--- a/src/Core/KeyManagement/Models/Api/Response/MasterPasswordUnlockResponseModel.cs
+++ b/src/Core/KeyManagement/Models/Api/Response/MasterPasswordUnlockResponseModel.cs
@@ -7,6 +7,10 @@ namespace Bit.Core.KeyManagement.Models.Api.Response;
 public class MasterPasswordUnlockResponseModel
 {
     public required MasterPasswordUnlockKdfResponseModel Kdf { get; init; }
+    /// <summary>
+    /// The user's symmetric key encrypted with their master key.
+    /// Also known as "MasterKeyWrappedUserKey"
+    /// </summary>
     [EncryptedString] public required string MasterKeyEncryptedUserKey { get; init; }
     [StringLength(256)] public required string Salt { get; init; }
 }
diff --git a/src/Core/KeyManagement/Models/Data/MasterPasswordUnlockAndAuthenticationData.cs b/src/Core/KeyManagement/Models/Data/MasterPasswordUnlockAndAuthenticationData.cs
index e305d92fec..ad3a0b692b 100644
--- a/src/Core/KeyManagement/Models/Data/MasterPasswordUnlockAndAuthenticationData.cs
+++ b/src/Core/KeyManagement/Models/Data/MasterPasswordUnlockAndAuthenticationData.cs
@@ -13,6 +13,10 @@ public class MasterPasswordUnlockAndAuthenticationData
 
     public required string Email { get; set; }
     public required string MasterKeyAuthenticationHash { get; set; }
+    /// <summary>
+    /// The user's symmetric key encrypted with their master key.
+    /// Also known as "MasterKeyWrappedUserKey"
+    /// </summary>
     public required string MasterKeyEncryptedUserKey { get; set; }
     public string? MasterPasswordHint { get; set; }