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diff --git a/doc/guix.texi b/doc/guix.texi
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@@ -988,7 +988,7 @@ Port number of SSH server on the machine.
@item @code{private-key} (default: @file{~root/.ssh/id_rsa})
The SSH private key file to use when connecting to the machine, in
-OpenSSH format.
+OpenSSH format. This key must not be protected with a passphrase.
Note that the default value is the private key @emph{of the root
account}. Make sure it exists if you use the default.