diff --git a/codec.rkt b/preserve.rkt
similarity index 99%
rename from codec.rkt
rename to preserve.rkt
index 260dff1..a085d2b 100644
--- a/codec.rkt
+++ b/preserve.rkt
@@ -1,4 +1,5 @@
 #lang racket/base
+;; Preserve, as in Fruit Preserve, as in a remarkably weak pun on pickling/dehydration etc
 
 (provide encode
          decode