diff --git a/README.md b/README.md
index 520e928..3221dc9 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@
 | **Protected** | 14 | 8 | `0x00` = unprotected |
 |||| `0x01` = AES-128 |
 |||| `0x02` = AES-192 |
-|||| `0x04` = AES-128 |
+|||| `0x04` = AES-256 |
 | **Version** | 15 | 8 | `0x00` = first (current) |
 | **HL** | 16 | 16 | `0x000a` = no options |
 | **MDL** | 18 | 16 | `0x0000` = no metadata |