diff --git a/README.md b/README.md
index d6c9ef6..ffbc824 100644
--- a/README.md
+++ b/README.md
@@ -253,7 +253,6 @@ for example: `chlink1_2`, `buslink5_6` etc..
 -   `link_fader_mute`: bool
 -   `amixenable`: bool
 -   `amixlock`: bool
--   `mute_group`: bool
 
 For the subclass `monitor` the following properties are available
 
@@ -268,6 +267,14 @@ For the subclass `monitor` the following properties are available
 
 for example: `config.monitor.chmode`
 
+#### `mute_group`
+
+tuple containing a class for each mute group
+
+-   `on`: bool, from 0 to 3
+
+for example: `config.mutegroup[0].on = True`
+
 ### `Tests`
 
 Unplug any expensive equipment before running tests.