MYNEWT-518 Update comments and design doc.
diff --git a/boot/bootutil/src/bootutil_misc.c b/boot/bootutil/src/bootutil_misc.c
index 1119bc2..c85f454 100644
--- a/boot/bootutil/src/bootutil_misc.c
+++ b/boot/bootutil/src/bootutil_misc.c
@@ -73,7 +73,7 @@
         /*          | slot-0     | slot-1     |
          *----------+------------+------------|
          *    magic | Any        | Good       |
-         * image-ok | Any        | N/A        |
+         * image-ok | Any        | [*]        |
          * ---------+------------+------------+---------------------------'
          * swap: test                                                     |
          * note: slot-1 image-ok val indicates whether swap is permanent; |