doc/design: note on the image trailer size
Image trailer might consume notable amount of image slot size.
This path adds note for emphasize that fact.
Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
diff --git a/docs/design.md b/docs/design.md
index e387e7e..b86c718 100755
--- a/docs/design.md
+++ b/docs/design.md
@@ -535,6 +535,14 @@
0x8079b62c,
};
```
+---
+***Note***
+Be aware that the image trailers make the ending area of the image slot
+unavailable for carrying the image data. In particular, the swap status size
+could be huge. For example, for 128 slot sectors with a 4-byte alignment,
+it would become 1536 B.
+
+---
## [Image trailers](#image-trailers)