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-rw-r--r--doc/guix.texi13
1 files changed, 12 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index c9760f5f60..5881adb221 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -453,6 +453,14 @@ When the daemon runs with @code{--no-substitutes}, clients can still
explicitly enable substitution @i{via} the @code{set-build-options}
remote procedure call (@pxref{The Store}).
+@item --substitute-urls=@var{urls}
+Consider @var{urls} the default whitespace-separated list of substitute
+source URLs. When this option is omitted, @code{http://hydra.gnu.org}
+is used.
+
+This means that substitutes may be downloaded from @var{urls}, as long
+as they are signed by a trusted signature (@pxref{Substitutes}).
+
@cindex build hook
@item --no-build-hook
Do not use the @dfn{build hook}.
@@ -981,7 +989,10 @@ also result from derivation builds, can be available as substitutes.
The @code{hydra.gnu.org} server is a front-end to a build farm that
builds packages from the GNU distribution continuously for some
-architectures, and makes them available as substitutes.
+architectures, and makes them available as substitutes. This is the
+default source of substitutes; it can be overridden by passing
+@command{guix-daemon} the @code{--substitute-urls} option
+(@pxref{Invoking guix-daemon}).
@cindex security
@cindex digital signatures