comment: add value range note to initialization

Requested-by: rewolff <R.E.Wolff@BitWizard.nl>
Reference: https://github.com/traviscross/mtr/pull/135#discussion_r74889440

diff --git a/curses.c b/curses.c
index 8782538f70ef52dd83f628c5de1d894b0d4a1889..c662db894f43570ed201819bfe75968d641c3761 100644 (file)
--- a/curses.c
+++ b/curses.c
@@ -516,7 +516,7 @@ void mtr_curses_init() {
                factors[i] *= factors[i]; /* Squared. */
        }
 
-       /* Initialize block_map. */
+       /* Initialize block_map.  The block_split is always smaller than 9 */
        block_split = (NUM_FACTORS - 2) / 2;
        for (i = 1; i <= block_split; i++) {
                block_map[i] = '0' + i;