diff --git a/contrib/sdl_checkpoints.pl b/contrib/sdl_checkpoints.pl
index 8b7ea54ea..938aee872 100755
--- a/contrib/sdl_checkpoints.pl
+++ b/contrib/sdl_checkpoints.pl
@@ -8,7 +8,11 @@
 
 use warnings;
 use strict;
-my $hush    = "./src/hush-cli";
+
+# call this script like this to generate checkpoints for a HAC such as DragonX:
+# CLI=./src/dragonx-cli ./contrib/sdl_checkpoints.pl ...
+
+my $hush    = $ENV{CLI} || "./src/hush-cli";
 my $gethash = "$hush getblockhash";
 my $gettree = "$hush getblockmerkletree";
 my $start   = shift || 300000;