diff --git a/cpu.js b/cpu.js
index 3a57d9f..3c04c19 100644
--- a/cpu.js
+++ b/cpu.js
@@ -298,16 +298,17 @@ async function stepCPU(debug = false) {
 }
 
 /**
- * @param {Uint8Array} code - Machine code to run
- * @param {Boolean} [debug] - Enable/disable debugging printouts
+ * @param {Uint8Array} code        - Machine code to run
+ * @param {Boolean}   [debug]      - Enable/disable debugging printouts
+ * @param {Number}    [clockSpeed] - CPU clock speed in milliseconds
  **/
-exports.runProgram = (code, debug = false, framerate = 10) => {
+exports.runProgram = (code, debug = false, clockSpeed = 10) => {
   startCPU(code);
   // Animate the output by pausing between steps
   const loop = setInterval(async () => {
     stepCPU(debug);
     if (!CPU.running) clearInterval(loop);
-  }, framerate);
+  }, clockSpeed);
 }