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diff --git a/doc/guix.texi b/doc/guix.texi
index f479fe05ff..01c16ba85d 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -17030,6 +17030,18 @@ This example assumes that the file @file{./guix.example.org-key.pub}
contains the public key that @code{guix.example.org} uses to sign
substitutes.
+@item @code{generate-substitute-key?} (default: @code{#t})
+Whether to generate a @dfn{substitute key pair} under
+@file{/etc/guix/signing-key.pub} and @file{/etc/guix/signing-key.sec} if
+there is not already one.
+
+This key pair is used when exporting store items, for instance with
+@command{guix publish} (@pxref{Invoking guix publish}) or @command{guix
+archive} (@pxref{Invoking guix archive}). Generating a key pair takes a
+few seconds when enough entropy is available and is only done once; you
+might want to turn it off for instance in a virtual machine that does
+not need it and where the extra boot time is a problem.
+
@item @code{max-silent-time} (default: @code{0})
@itemx @code{timeout} (default: @code{0})
The number of seconds of silence and the number of seconds of activity,