diff --git a/impl/src/layer1/rx.c b/impl/src/layer1/rx.c
index 81084b1..f33b5d9 100644
--- a/impl/src/layer1/rx.c
+++ b/impl/src/layer1/rx.c
@@ -163,7 +163,9 @@ static enum squelch_state_t update_and_check_squelch(layer1_rx_t *rx, unsigned i
 		if(level < rx->noise_floor_level) {
 			rx->noise_floor_level = level;
 		} else {
-			level += 1e-4f; // slowly increase the measured noise floor level to compensate for drift
+			// Slowly increase the measured noise floor level to compensate for drift.
+			// Adjustment value is in dB.
+			rx->noise_floor_level += 1e-4f;
 		}
 		agc_crcf_squelch_set_threshold(rx->agc, rx->noise_floor_level + 10.0f); // in dB
 	}