diff --git a/Src/DSInternals.Common/Data/Principals/KerberosKeyType.cs b/Src/DSInternals.Common/Data/Principals/KerberosKeyType.cs
index 496e3df..9e366f4 100644
--- a/Src/DSInternals.Common/Data/Principals/KerberosKeyType.cs
+++ b/Src/DSInternals.Common/Data/Principals/KerberosKeyType.cs
@@ -1,11 +1,32 @@
 
 namespace DSInternals.Common.Data
 {
+    /// <summary>
+    /// Key types corresponding to various kerberos encryption types, as defined in ntsecapi.h.
+    /// </summary>
     public enum KerberosKeyType : int
     {
-        DES_CBC_CRC = 1,
-        DES_CBC_MD5 = 3,
-        AES128_CTS_HMAC_SHA1_96 = 17,
-        AES256_CTS_HMAC_SHA1_96 = 18
+        NULL =                             0,
+        DES_CBC_CRC =                      1,
+        DES_CBC_MD4 =                      2,
+        DES_CBC_MD5 =                      3,
+        AES128_CTS_HMAC_SHA1_96 =         17,
+        AES256_CTS_HMAC_SHA1_96 =         18,
+        DES_CBC_MD5_NT =                  20,
+        RC4_HMAC_NT =                     23,
+        RC4_HMAC_NT_EXP =                 24,
+        RC4_MD4 =                       -128,
+        RC4_PLAIN2 =                    -129,
+        RC4_LM =                        -130,
+        RC4_SHA =                       -131,
+        DES_PLAIN =                     -132,
+        RC4_HMAC_OLD =                  -133,
+        RC4_PLAIN_OLD =                 -134,
+        RC4_HMAC_OLD_EXP =              -135,
+        RC4_PLAIN_OLD_EXP =             -136,
+        RC4_PLAIN =                     -140,
+        RC4_PLAIN_EXP =                 -141,
+        AES128_CTS_HMAC_SHA1_96_PLAIN = -148,
+        AES256_CTS_HMAC_SHA1_96_PLAIN = -149
     }
 }