diff --git a/README.md b/README.md
index 277c965..e8e1417 100644
--- a/README.md
+++ b/README.md
@@ -44,5 +44,8 @@ sudo make uninstall
 # USB 3.0 Support
 You can try use `modprobe 88x2bu rtw_switch_usb_mode=1` to force the adapter run under USB 3.0. But if your adapter/port/motherboard not support it, the driver will be in restart loop. Remove the parameter and reload the driver to restore.
 
+# Debug
+Set debug log use `echo 5 > /proc/net/rtl88x2bu/log_level` or `modprobe 88x2bu rtw_drv_log_level=5`
+
 # Distribution
 * Archlinux AUR https://aur.archlinux.org/packages/rtl88x2bu-dkms-git/