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-rw-r--r--doc/manual/expressions/advanced-attributes.xml14
1 files changed, 14 insertions, 0 deletions
diff --git a/doc/manual/expressions/advanced-attributes.xml b/doc/manual/expressions/advanced-attributes.xml
index db981b607..a9b97b91a 100644
--- a/doc/manual/expressions/advanced-attributes.xml
+++ b/doc/manual/expressions/advanced-attributes.xml
@@ -322,6 +322,20 @@ big = "a very long string";
</varlistentry>
+
+ <varlistentry><term><varname>allowSubstitutes</varname></term>
+
+ <listitem><para>If this attribute is set to
+ <literal>false</literal>, then Nix will always build this
+ derivation; it will not try to substitute its outputs. This is
+ useful for very trivial derivations (such as
+ <function>writeText</function> in Nixpkgs) that are cheaper to
+ build locally than to substitute from a binary
+ cache.</para></listitem>
+
+ </varlistentry>
+
+
</variablelist>
</section>