diff --git a/tools/led_gpio_utils/README.md b/tools/led_gpio_utils/README.md
index bdb0f32..65e1a35 100644
--- a/tools/led_gpio_utils/README.md
+++ b/tools/led_gpio_utils/README.md
@@ -115,7 +115,10 @@ Install with:
 pip3 install smbus2
 ```
 
-## Common Usage Patterns
+## Common Use Cases
+
+Both `i2c_read_rtl_gpio.py` and `i2c_dump_rtl_regs.py` shall run with the **original** firmware, not RTLPlayground firmware.
+
 
 ### Monitoring GPIO Changes
 ```bash