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diff --git a/docs/feature_audio.md b/docs/feature_audio.md
index 82e0ed950..a39c45687 100644
--- a/docs/feature_audio.md
+++ b/docs/feature_audio.md
@@ -65,6 +65,13 @@ The available keycodes for audio are:
 * `AU_OFF` - Turn audio mode off
 * `AU_TOG` - Toggle audio mode
 
+## ARM Audio Volume
+
+For ARM devices, you can adjust the DAC sample values. If your board is too loud for you or your coworkers, you can set the max using `DAC_SAMPLE_MAX` in your `config.h`:
+
+```c
+#define DAC_SAMPLE_MAX 65535U
+```
 
 ## Music Mode