AMSB.txt: tweak.

1 files changed, 2 insertions, 1 deletions

diff --git a/AMSB.txt b/AMSB.txt
index 7869acf..0d458a7 100644
--- a/AMSB.txt
+++ b/AMSB.txt
@@ -259,7 +259,8 @@ editing the program (you get LK ERROR if you try).
 
 The "encryption" is no better than ROT13. To encrypt, subtract each
 byte from 0x54 (in an 8-bit register, using twos complement). To
-decrypt, do the same.
+decrypt, do the same. This is a reciprocal cipher, and you can think
+of it as the binary equivalent of ROT13.
 
 You can tell a LOCKed program because its first byte will be 1 instead
 of 0. The next 2 bytes (the program length) unencrypted. The rest of