diff --git a/Marlin/src/pins/ramps/pins_RAMPS.h b/Marlin/src/pins/ramps/pins_RAMPS.h
index e033cfd060..8237c7e227 100644
--- a/Marlin/src/pins/ramps/pins_RAMPS.h
+++ b/Marlin/src/pins/ramps/pins_RAMPS.h
@@ -486,15 +486,15 @@
 #endif
 
 //
-// AUX1    5V  GND D2  D1
+// AUX1    5V  GND D1  D0
 //          2   4   6   8
 //          1   3   5   7
 //         5V  GND A3  A4
 //
 #define AUX1_05                               57  // (A3)
-#define AUX1_06                                2
+#define AUX1_06                                1  // TX0
 #define AUX1_07                               58  // (A4)
-#define AUX1_08                                1
+#define AUX1_08                                0  // RX0
 
 //
 // AUX2    GND A9 D40 D42 A11