diff --git a/Fonderie/filterstack.c b/Fonderie/filterstack.c
index 37c3428..3e93c7c 100644
--- a/Fonderie/filterstack.c
+++ b/Fonderie/filterstack.c
@@ -118,7 +118,7 @@ for (idx=0; idx<f_stacks[numid].count; idx++) {
 	fv  = f_stacks[numid].slots[idx].fval;
 
 	if (verbosity > 1)
-		fprintf(stderr, "stack %d pass %d : effect %2d on %p\n",
+		fprintf(stderr, "stack %d  idx %d : effect %2d on %p\n",
 				numid, idx, eff, target);
 
 	foo = crapulator(target, eff, fv);