diff --git a/buttons.cfg b/buttons.cfg
index fd54fd6..284aeb1 100644
--- a/buttons.cfg
+++ b/buttons.cfg
@@ -1,17 +1,22 @@
 [button]
-    names=switch1,switch2,switch3
+    names=switch1,switch2,switch3,switch4
 
 [switch1]
-    pin: 4
+    pin: 12
     close: "gm21/2"
     open: "gm21/1"
 
 [switch2]
-    pin: 5
+    pin: 16
     close: "gm22/2"
     open: "gm22/1"
 
 [switch3]
-    pin: 6
+    pin: 20
     close: "gm23/2"
     open: "gm23/1"
+
+[switch4]
+    pin: 21
+    close: "gm24/2"
+    open: "gm24/1"