diff --git a/configs/app.toml b/configs/app.toml
index d9983ff..da408ea 100644
--- a/configs/app.toml
+++ b/configs/app.toml
@@ -10,6 +10,9 @@ extends_horizontal=true
 [channel]
 width=80
 height=130
-# default submix bus (0-7 corresponding to A1,A2..B2,B3)
+# size of a single mouse wheen scroll step
+[mwscroll_step]
+size=3
+# default submix bus
 [submixes]
 default=0