diff --git a/README.md b/README.md
index a15dcb87f99ca3bc0129df558c15bc87cd0d2010..a546b4809282186f97ff7df2fef4dbee69188d56 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,9 @@ _**Design overview**_
 
 _Buttons provide:_
 1. Right and left click.
-2. Forward and backwards, which are two macro buttons.
-3. Sense up and sense down, two buttons to control mouse sensitivity.
+2. Mouse wheel click.
+3. Forward and backwards, which are two macro buttons.
+4. Sense up and sense down, two buttons to control mouse sensitivity.
 
 _Sensor provide position data._