diff --git a/GITHUB_SHA.h b/GITHUB_SHA.h
index 9564209..355e2e9 100644
--- a/GITHUB_SHA.h
+++ b/GITHUB_SHA.h
@@ -1 +1 @@
-#define GITHUB_SHA "devel-202305022149Z"
+#define GITHUB_SHA "devel-202305201256Z"
diff --git a/config.example.h b/config.example.h
index 2a8a11a..058bc7a 100644
--- a/config.example.h
+++ b/config.example.h
@@ -224,5 +224,15 @@ The configuration file for DCC-EX Command Station
 //
 //#define SERIAL_BT_COMMANDS
 
+// SABERTOOTH
+//
+// This is a very special option and only useful if you happen to have a
+// sabertooth motor controller from dimension engineering configured to
+// take commands from and ESP32 via serial at 9600 baud from GPIO17 (TX)
+// and GPIO16 (RX, currently unused).
+// The number defined is the DCC address for which speed controls are sent
+// to the sabertooth controller _as_well_. Default: Undefined.
+//
+//#define SABERTOOTH 1
 
 /////////////////////////////////////////////////////////////////////////////////////
diff --git a/version.h b/version.h
index f168477..030cff6 100644
--- a/version.h
+++ b/version.h
@@ -4,7 +4,8 @@
 #include "StringFormatter.h"
 
 
-#define VERSION "4.2.47"
+#define VERSION "4.2.52"
+// 4.2.52 - Experimental support for sabertooth motor controller on ESP32
 // 4.2.47 - Correct response to <JA 0>
 // 4.2.46 - Support boards with inverted fault pin
 // 4.2.45 - Add ONCLOCKMINS to FastClock to allow hourly repeat events