diff --git a/XCI_Explorer/MainForm.cs b/XCI_Explorer/MainForm.cs
index ca76fda..74852a7 100644
--- a/XCI_Explorer/MainForm.cs
+++ b/XCI_Explorer/MainForm.cs
@@ -149,8 +149,8 @@ where x.Length > 1
             int num2 = NCA.NCA_Headers[0].MasterKeyRev - 1;
             string capchar = num2.ToString("X");
             string lowchar = capchar.ToLower();
-            Mkey += num2.ToString();
-            MkeyL += num2.ToString();
+            Mkey += capchar;
+            MkeyL += lowchar;
         }
         try
         {
diff --git a/XCI_Explorer/Util.cs b/XCI_Explorer/Util.cs
index f9b6716..6f5a2fd 100644
--- a/XCI_Explorer/Util.cs
+++ b/XCI_Explorer/Util.cs
@@ -38,11 +38,11 @@ public static string GetMkey(byte id)
             12 => "MasterKey11 (12.1.0)",
             13 => "MasterKey12 (13.0.0-13.2.1)",
             14 => "MasterKey13 (14.0.0-14.1.2)",
-            15 => "MasterKey14 (15.0.0-?)",
-            16 => "MasterKey15",
-            17 => "MasterKey16",
-            18 => "MasterKey17",
-            19 => "MasterKey18",
+            15 => "MasterKey14 (15.0.0-15.0.1)",
+            16 => "MasterKey15 (16.0.0-16.1.0)",
+            17 => "MasterKey16 (17.0.0-17.0.1)",
+            18 => "MasterKey17 (18.0.0-18.1.0)",
+            19 => "MasterKey18 (19.0.0-?)",
             20 => "MasterKey19",
             21 => "MasterKey20",
             22 => "MasterKey21",