diff --git a/README.md b/README.md
index 2cc5a1c..7b8f1c2 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,8 @@ Sample instanciation reading playlist entries from a file `./mp3.m3u`:
 
 ## Contributing
 
+* Use `npm install` to install some JavaScript utilities.
+* Use `make` to perform a build of the software.
 * See subdirectory [src](./src) for javascript sources, specifically [player.js](src/player.js).
   - Use `src/build.sh` to re-generate the minified script `js/myplayer.min.js`.
 * See subdirectory [css](./css) for CSS, specifically [local.js](src/local.js).