diff --git a/docs/Instruction/tips/register_bit.md b/docs/Instruction/tips/register_bit.md
index 18e2840302e9de5cd40e53a67a037dea9da70b52..70b4b24cb8d98ed78e413bf48b268ca363ddad4b 100644
--- a/docs/Instruction/tips/register_bit.md
+++ b/docs/Instruction/tips/register_bit.md
@@ -210,7 +210,7 @@ void loop() {
   delay(500);
   PORTA.OUT |= 0b00010000;  //Set PA4 to HIGH...(2)
   delay(500);
-  PORTA.OUT &= ~0b00000001; //Set PA0 to LOW....(3)
+  PORTA.OUT &= ~0b00000001; //Set PA0 to LOW ( Remaining PA4 setting )....(3)
 }
 ```
 ### What to work in (1)(2)(3)