From 19afbcdc18ba0158cad3c70460beda2ad2786777 Mon Sep 17 00:00:00 2001
From: vcolin7 <vicolina@microsoft.com>
Date: Fri, 6 Feb 2026 16:13:29 -0800
Subject: [PATCH] Update MCPB signature format description

Clarify the MCPB signature format in documentation.
---
 CLI.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CLI.md b/CLI.md
index 02787f8..247f211 100644
--- a/CLI.md
+++ b/CLI.md
@@ -292,7 +292,8 @@ MCPB uses PKCS#7 (Cryptographic Message Syntax) for digital signatures:
 ```
 [Original MCPB ZIP content]
 MCPB_SIG_V1
-[Base64-encoded PKCS#7 signature]
+[4-byte little-endian length prefix]
+[DER-encoded PKCS#7 signature]
 MCPB_SIG_END
 ```