diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index c736ef2e3..3c46e5daa 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -1398,8 +1398,10 @@ inp_add_control_section(struct line *deck, int *line_number)
             found_control = FALSE;
 
             if (!found_run) {
+                // prev_card->li_next === c
                 prev_card->li_next = xx_new_line(c, copy("run"), (*line_number)++, 0);
                 prev_card = prev_card->li_next;
+                // again: prev_card->li_next === c
                 found_run = TRUE;
             }