diff --git a/docs/en/unit/button.md b/docs/en/unit/button.md
index d886909b..268d519f 100644
--- a/docs/en/unit/button.md
+++ b/docs/en/unit/button.md
@@ -14,7 +14,9 @@
 
 <img src="assets/img/product_pics/unit/button/unit_button_02.png"  width="50%" height="50%">
 
+**Output status:**
 
+<img src="assets/img/product_pics/unit/button/unit_button_03.png">
 
 This unit communicates with M5Core through GROVE B port.