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-rw-r--r--Documentation/module-signing.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/module-signing.txt b/Documentation/module-signing.txt
index c72702ec1ded..faaa6ea002f7 100644
--- a/Documentation/module-signing.txt
+++ b/Documentation/module-signing.txt
@@ -194,6 +194,9 @@ The hash algorithm used does not have to match the one configured, but if it
doesn't, you should make sure that hash algorithm is either built into the
kernel or can be loaded without requiring itself.
+If the private key requires a passphrase or PIN, it can be provided in the
+$KBUILD_SIGN_PIN environment variable.
+
============================
SIGNED MODULES AND STRIPPING