diff --git a/README.md b/README.md
index c5f2f6a..5de08f9 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ This version updated April 2016 for Tidal 0.7 (jumping three whole major patches
 
 Older versions of this composition with original notes are available on the `original-notes` tag of this repository.
 
-### battery123-megalet.tidal
+### battery123.megalet.tidal
 
 Contains a big `let` directive to initialize all variables used in `battery123.tidal` (where they are recorded separately). Eval the whole block with `C-c C-e` and dive in.
 
diff --git a/battery123-megalet.tidal b/battery123.megalet.tidal
similarity index 100%
rename from battery123-megalet.tidal
rename to battery123.megalet.tidal