diff --git a/README.md b/README.md
index d4523ff..ad5d226 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,21 @@ Press `A` and `D` to steer the ship left and right, `W` to move forwards and `K`
 
 You can play Mathsteroids at [mscroggs.co.uk/mathsteroids](http://www.mscroggs.co.uk/mathsteroids).
 
+## Building
+Mathsteroids can be run directly in a web environment with PHP by navigating to `index.php`.
+Alternatively, a pure HTML version can be generated by running:
+
+```
+make html
+```
+
+The HTML that this generates will include links to some of the javascript files. To instead
+generate a HTML file that inlines all of the javascript, run:
+
+```
+make html-single-page
+```
+
 ## Surfaces
 The following surfaces are currently available: