diff --git a/MIDI-Input.md b/MIDI-Input.md
index c8567ba..40c4395 100644
--- a/MIDI-Input.md
+++ b/MIDI-Input.md
@@ -93,3 +93,16 @@ If this value is smaller than the poll period (for 60Hz poll rate game, if this
 
 For reference, 1/16th note at 200bpm is 75ms.
 
+## My MIDI device doesn't work properly
+
+To view raw stream of MIDI data,
+
+1. open spicecfg.
+2. click on Overlay tab
+3. at the bottom, check `Enable Overlay in Config`
+4. press F9 (Toggle Control hotkey)
+5. expand `RawInput`
+6. click on `MIDI Control` button
+7. bang on your MIDI drums
+
+If you want to report a bug, please attach the screenshot of the above, and explain which data corresponds to which action.