diff --git a/GITHUB_SHA.h b/GITHUB_SHA.h
index 79f8829..00cb9db 100644
--- a/GITHUB_SHA.h
+++ b/GITHUB_SHA.h
@@ -1 +1 @@
-#define GITHUB_SHA "devel-z21-202404011058Z"
+#define GITHUB_SHA "devel-z21-202404012012Z"
diff --git a/version.h b/version.h
index dba878f..568f77b 100644
--- a/version.h
+++ b/version.h
@@ -4,6 +4,7 @@
 #include "StringFormatter.h"
 
 #define VERSION "5.X.Y"
+//          Make Z21 diag selectable from DCCEXParser
 //          Z21 error fix for turnout feedback
 //          Z21 add turnout and sensor broadcasts
 //          Z21: report the (unchanged) loco mode back after every attempted change