diff --git a/doc/README.md b/doc/README.md
index ca2a537..7684fa0 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -89,7 +89,7 @@ module_name: **drv_xpu**
 
 reg_idx|meaning|comment
 -------|-------|----
-x|x|to be defined
+7|git revision when build the driver|example: return value 0071bc74 means git revision is 071bc74 (the 1st 0 must be removed!)
 
 module_name: **rf**
 
@@ -140,6 +140,7 @@ reg_idx|meaning|comment
 31|openwifi MAC address high 32bit|check XPU_REG_MAC_ADDR_write in sdr.c to see how we set MAC address to FPGA when NIC start
 58|TSF runtime value low  32bit|read only
 59|TSF runtime value high 32bit|read only
+63|git revision when build the driver|example: return value 065272ac means git revision is 65272ac (the 1st 0 must be removed!)
 
 ## Rx packet flow and filtering config