diff --git a/docs/en/product_documents/m5stack-core/m5core_fire.md b/docs/en/product_documents/m5stack-core/m5core_fire.md
index ccfb6011..112e2b15 100644
--- a/docs/en/product_documents/m5stack-core/m5core_fire.md
+++ b/docs/en/product_documents/m5stack-core/m5core_fire.md
@@ -96,7 +96,7 @@ M5Go CHG. Base is composed of POGO pin. M5Go Base is composed of PORT B, PORT C,
 
 **MEMS Chip**
 
-*MPU9250 i2c address: 0x68*
+<mark>*MPU9250 i2c address: 0x68*</mark>
 
 | MPU9250       | ESP32 Chip    |
 | :----------:  |:------------: |
@@ -180,4 +180,4 @@ M5Go CHG. Base is composed of POGO pin. M5Go Base is composed of PORT B, PORT C,
 
 <figure>
     <img src="assets/img/product_pics/core/fire/m5_fire_02.jpg" >
-</figure>
\ No newline at end of file
+</figure>