diff --git a/PPM-Control.md b/PPM-Control.md
index ff7c4bb..fa35e7c 100644
--- a/PPM-Control.md
+++ b/PPM-Control.md
@@ -10,6 +10,7 @@ Default number of channels for PPM in config.h is 6.
 If the board is beeping
 * Check the number of channels, even if you transmitter only handles 6 channels, you receiver might transmit more channels
 * Make sure you enabled PPM on your transmitter
+* Make sure you are using the sensor cable(left or right) you selected in config.h
 
 ⚠ Red wire from sensor cable delivers 15v !!!
 Use 3.3v from programming port, 5v from hall sensor cable, or a voltage regulator.
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