diff --git a/src/viewer/text/festival.c b/src/viewer/text/festival.c
index ce9889d1..f0b42b52 100644
--- a/src/viewer/text/festival.c
+++ b/src/viewer/text/festival.c
@@ -72,6 +72,7 @@ write_to_festival(struct fest *fest)
 
 	data = doc->data[fest->line].chars;
 	add_to_string(&buf, "(SayText \"");
+	/* UTF-8 not supported yet. If festival support UTF-8? */
 	for (i = 0; i < len; i++) {
 		unsigned char ch = (unsigned char)data[i].data;