[PATCH v2 3/3] bitmap-format.txt: add information for trailing checksum

["Abhradeep Chakraborty via GitGitGadget" <gitgitgadget@gmail.com>]

From: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>

Bitmap file has a trailing checksum at the end of the file. However
there is no information in the bitmap-format documentation about it.

Add a trailer section to include the trailing checksum info in the
`Documentation/technical/bitmap-format.txt` file.

Signed-off-by: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>
---
 Documentation/technical/bitmap-format.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/technical/bitmap-format.txt b/Documentation/technical/bitmap-format.txt
index f22669b5916..a43d2fe2bbf 100644
--- a/Documentation/technical/bitmap-format.txt
+++ b/Documentation/technical/bitmap-format.txt
@@ -125,6 +125,10 @@ MIDXs, both the bit-cache and rev-cache extensions are required.
 
 		** The compressed bitmap itself, see Appendix A.
 
+	* TRAILER:
+
+		Index checksum of the above contents. It is a 20-byte SHA1 checksum.
+
 == Appendix A: Serialization format for an EWAH bitmap
 
 Ewah bitmaps are serialized in the same protocol as the JAVAEWAH
-- 
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