diff --git a/src/track/loader/Loader.js b/src/track/loader/Loader.js
index 14793440..346d189b 100644
--- a/src/track/loader/Loader.js
+++ b/src/track/loader/Loader.js
@@ -35,6 +35,8 @@ export default class {
   fileLoad(e) {
     const audioData = e.target.response || e.target.result;
 
+    // TODO: Here, detect if the `audioData` is of type MIDI.
+
     this.setStateChange(STATE_DECODING);
 
     return new Promise((resolve, reject) => {