diff --git a/common/drawtext.c b/common/drawtext.c
index 938e1aeb..ca66796a 100644
--- a/common/drawtext.c
+++ b/common/drawtext.c
@@ -2,6 +2,8 @@
 #include "../ui.h"
 #include "uipriv.h"
 
+// TODO this doesn't handle the case where nLines == 0
+// TODO this should never happen even if there are no characters??
 // TODO figure out how to make this work on GTK+
 void uiDrawCaret(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout, size_t pos, int *line)
 {