diff --git a/cmd/root.go b/cmd/root.go
index d46454b..a43fd45 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -80,6 +80,8 @@ func parse(cmd *cobra.Command, args []string) {
 	a := graph.AdjacencyMatrix()
 	out := mat.Formatted(a, fmtOptions...)
 
+	// for matlab and python formats, %#v outputs as matrix and %v is
+	// oneline, but for standard format, it's the opposite, so we xor
 	if (matlabFmt || pythonFmt) != oneline {
 		fmt.Printf("%#v\n", out)
 	} else {