diff --git a/tools/led_gpio_utils/README.md b/tools/led_gpio_utils/README.md
index 4205e68..bdb0f32 100644
--- a/tools/led_gpio_utils/README.md
+++ b/tools/led_gpio_utils/README.md
@@ -1,6 +1,8 @@
 # LED GPIO Utilities
 
-This directory contains utility talking to RTL837x switch IC via I2C bus. These scripts are designed to help with monitoring, debugging GPIO, and identifying LED configurations.
+This directory contains utility talking to RTL837x switch IC via I2C bus.
+These scripts are designed to help with monitoring, debugging GPIO, and identifying LED configurations.
+(Only tested in Linux)
 
 ## Hardware requirements