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-rw-r--r--doc/manual/conf-file.xml9
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/manual/conf-file.xml b/doc/manual/conf-file.xml
index 10e6d08cde76..f220c8374ae6 100644
--- a/doc/manual/conf-file.xml
+++ b/doc/manual/conf-file.xml
@@ -225,6 +225,15 @@ env-keep-derivations = false
   </varlistentry>
 
   
+  <varlistentry><term><literal>build-use-substitutes</literal></term>
+
+    <listitem><para>If set to <literal>true</literal> (default), Nix
+    will use binary substitutes if available.  This option can be
+    disabled to force building from source.</para></listitem>
+
+  </varlistentry>
+
+    
   <varlistentry xml:id="conf-build-chroot-dirs"><term><literal>build-chroot-dirs</literal></term>
 
     <listitem><para>When builds are performed in a chroot environment,