format-patch: add "--signature-file=<file>" option

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 1932e9b9a2be5437dd467f91472318a5bf1bb992..140ed771efc1e664262809d804ea7b9100cd049c 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1114,6 +1114,10 @@ format.signature::
        Set this variable to the empty string ("") to suppress
        signature generation.
 
+format.signaturefile::
+       Works just like format.signature except the contents of the
+       file specified by this variable will be used as the signature.
+
 format.suffix::
        The default for format-patch is to output files with the suffix
        `.patch`. Use this variable to change that suffix (make sure to