diff --git a/common-params.go b/common-params.go
index 4fac4d8..bcfe137 100644
--- a/common-params.go
+++ b/common-params.go
@@ -20,3 +20,8 @@ const (
 	ParamFilepath  = "filepath"
 	ParamDirpath   = "dirpath"
 )
+
+// to be moved in its own source file
+const (
+	ConstLastIndex = 0xFFFF_FFFF
+)
\ No newline at end of file