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-rw-r--r--doc/guix.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 05ce7858d5..ba4fe1a826 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -3983,6 +3983,9 @@ This means that substitutes may be downloaded from @var{urls}, provided
they are signed by a key authorized by the system administrator
(@pxref{Substitutes}).
+When @var{urls} is the empty string, substitutes are effectively
+disabled.
+
@item --no-substitutes
Do not use substitutes for build products. That is, always build things
locally instead of allowing downloads of pre-built binaries