Added support for audio using pins C4, C5, B6, B7

1 files changed, 12 insertions, 1 deletions

diff --git a/docs/feature_audio.md b/docs/feature_audio.md
index 5b11aa3ab..eaaa2fe51 100644
--- a/docs/feature_audio.md
+++ b/docs/feature_audio.md
@@ -1,6 +1,17 @@
 # Audio
 
-Your keyboard can make sounds! If you've got a Planck, Preonic, or basically any AVR keyboard that allows access to the C6 or B5 port (`#define C6_AUDIO` and/or `#define B5_AUDIO`), you can hook up a simple speaker and make it beep. You can use those beeps to indicate layer transitions, modifiers, special keys, or just to play some funky 8bit tunes.
+Your keyboard can make sounds! If you've got a Planck, Preonic, or basically any AVR keyboard that allows access to certain PWM-capable pins, you can hook up a simple speaker and make it beep. You can use those beeps to indicate layer transitions, modifiers, special keys, or just to play some funky 8bit tunes.
+
+Up to two simultaneous audio voices are supported, one driven by timer 1 and another driven by timer 3.  The following pins can be defined as audio outputs in config.h:
+Timer 1:
+`#define B5_AUDIO`
+`#define B6_AUDIO`
+`#define B7_AUDIO`
+
+Timer 3:
+`#define C4_AUDIO`
+`#define C5_AUDIO`
+`#define C6_AUDIO`
 
 If you add `AUDIO_ENABLE = yes` to your `rules.mk`, there's a couple different sounds that will automatically be enabled without any other configuration: