diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst
index 1b84f818e574..8d38b47b7b83 100644
--- a/Documentation/filesystems/fscrypt.rst
+++ b/Documentation/filesystems/fscrypt.rst
@@ -1382,7 +1382,8 @@ directory.)  These structs are defined as follows::
             u8 contents_encryption_mode;
             u8 filenames_encryption_mode;
             u8 flags;
-            u8 __reserved[4];
+            u8 log2_data_unit_size;
+            u8 __reserved[3];
             u8 master_key_identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];
             u8 nonce[FSCRYPT_FILE_NONCE_SIZE];
     };