diff --git a/drivers/g-wolves/g-wolves.h b/drivers/g-wolves/g-wolves.h
index 2c9475c..7e56b10 100644
--- a/drivers/g-wolves/g-wolves.h
+++ b/drivers/g-wolves/g-wolves.h
@@ -55,6 +55,7 @@ typedef struct DPI_LEVEL
     uint8_t dpi_x_high;
     uint8_t dpi_x_low;
     
+    // Older firmware does not support y dpi (only 1 dpi value)
     uint8_t dpi_y_high;
     uint8_t dpi_y_low;