diff --git a/%E4%B8%89%E8%BB%B8%E5%B9%B3%E5%8F%B0IO%E8%A8%AD%E5%AE%9A_V1.md b/%E4%B8%89%E8%BB%B8%E5%B9%B3%E5%8F%B0IO%E8%A8%AD%E5%AE%9A_V1.md
index 6285548..2b64c6e 100644
--- a/%E4%B8%89%E8%BB%B8%E5%B9%B3%E5%8F%B0IO%E8%A8%AD%E5%AE%9A_V1.md
+++ b/%E4%B8%89%E8%BB%B8%E5%B9%B3%E5%8F%B0IO%E8%A8%AD%E5%AE%9A_V1.md
@@ -135,4 +135,5 @@ void go_home(){
 
  ```
 ### 電路圖
+  找馬達線圈：通常四條線兩組線圈，電表短路檔，找兩條出來量，有短路表示為一組線圈，該組線圈兩條接A線圈、B線圈都可，正負反了沒關係，但別一條接A一條接B，千萬別接錯會燒
 ![](http://140.125.21.65:8418/Education/MCU/raw/branch/master/PPT/circuit.jpg)
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