diff --git a/docs/Product/ioNIC/W55RP20/W55RP20-S2E/mac_address-write-guide-en.md b/docs/Product/ioNIC/W55RP20/W55RP20-S2E/mac_address-write-guide-en.md
index ee29837832..b02483b1ac 100644
--- a/docs/Product/ioNIC/W55RP20/W55RP20-S2E/mac_address-write-guide-en.md
+++ b/docs/Product/ioNIC/W55RP20/W55RP20-S2E/mac_address-write-guide-en.md
@@ -38,8 +38,8 @@ The MAC address is stored in different memory address from the firmware area of
 
 There are two ways to write MAC Address
 
-- [Using WIZMacTool](#Using-WIZMacTool)
-- [Using Serial Command](#Using-Serial-Command)
+- [Using WIZMacTool](#using-wizmactool)
+- [Using Serial Command](#using-serial-command)
 
 
 ## Using WIZMacTool