diff --git a/RotatingCube/RotatingCube.html b/RotatingCube/RotatingCube.html
index a581241..08b1471 100644
--- a/RotatingCube/RotatingCube.html
+++ b/RotatingCube/RotatingCube.html
@@ -3,7 +3,7 @@
- Draw cube with specification of face color
+ Draw orthographic cube with specification of face color, and rotate when buttons pressed
diff --git a/RotatingCube/RotatingCube.js b/RotatingCube/RotatingCube.js
index ef485d8..0c3db0c 100644
--- a/RotatingCube/RotatingCube.js
+++ b/RotatingCube/RotatingCube.js
@@ -25,7 +25,9 @@ const fragment_shader = `
gl_FragColor = v_Color;
} `;
+// gl = WebGL context, n = # vertices
var gl, n;
+// v_rotate: {x: pitch, y: yaw, z: roll}
var v_rotate = {x: 0, y:0, z:0};
function main() {