diff --git a/README.md b/README.md
index d3e8dc4..e274eed 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,7 @@ brew cask install background-music
 If you want the snapshot version:
 
 ```bash
+brew tap homebrew/cask-versions
 brew cask install background-music-pre
 ```