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-rw-r--r--tools/binman/README.entries5
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diff --git a/tools/binman/README.entries b/tools/binman/README.entries
index 31bc725d57..5cb52a92ff 100644
--- a/tools/binman/README.entries
+++ b/tools/binman/README.entries
@@ -546,6 +546,11 @@ Properties / Entry arguments:
- kernelkey: Name of the kernel key to use (inside keydir)
- preamble-flags: Value of the vboot preamble flags (typically 0)
+Output files:
+ - input.<unique_name> - input file passed to futility
+ - vblock.<unique_name> - output file generated by futility (which is
+ used as the entry contents)
+
Chromium OS signs the read-write firmware and kernel, writing the signature
in this block. This allows U-Boot to verify that the next firmware stage
and kernel are genuine.