diff --git a/docs/en/product_documents/m5stack-core/m5core_fire.md b/docs/en/product_documents/m5stack-core/m5core_fire.md
index 112e2b15..e60d32eb 100644
--- a/docs/en/product_documents/m5stack-core/m5core_fire.md
+++ b/docs/en/product_documents/m5stack-core/m5core_fire.md
@@ -160,6 +160,10 @@ M5Go CHG. Base is composed of POGO pin. M5Go Base is composed of PORT B, PORT C,
 
 ## READ MORE
 
+### The difference between M5Cores
+
+https://github.com/m5stack/M5-Schematic/blob/master/Core/hardware_diff_between_m5cores.md
+
 ### Diagram of Fire
 
 <figure>