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diff --git a/Marlin/src/gcode/sd/M20.cpp b/Marlin/src/gcode/sd/M20.cpp
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+++ b/Marlin/src/gcode/sd/M20.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(SDSUPPORT)
+
+#include "../gcode.h"
+#include "../../sd/cardreader.h"
+
+/**
+ * M20: List SD card to serial output
+ */
+void GcodeSuite::M20() {
+  if (card.flag.mounted) {
+    SERIAL_ECHOLNPGM(STR_BEGIN_FILE_LIST);
+    card.ls();
+    SERIAL_ECHOLNPGM(STR_END_FILE_LIST);
+  }
+  else
+    SERIAL_ECHO_MSG(STR_NO_MEDIA);
+}
+
+#endif // SDSUPPORT