diff --git a/README.md b/README.md
index d68155b..d6ae626 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@
 - LED control
 - Power saving control
 - Driver debug log level control
+- REGD source selection
 - Security:
   * WEP 64/128-bit, WPA, WPA2, and WPA3
 
@@ -251,6 +252,12 @@ Driver LED control, rtw_led_ctrl=
 2:led on
 ```
 
+Driver REGD source selection, rtw_regd_src=
+```
+0:Realtek defined
+1:OS (default, get channel plan from OS)
+```
+
 ### Connecting with wpa_supplicant
 
 Example wpa_supplicant.conf with WPA3-Personal (WPA3-SAE).