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-rw-r--r--doc/manual/env-common.xml11
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/manual/env-common.xml b/doc/manual/env-common.xml
index 7a436bebac34..cf84dd05496c 100644
--- a/doc/manual/env-common.xml
+++ b/doc/manual/env-common.xml
@@ -107,6 +107,17 @@ $ mount -o bind /mnt/otherdisk/nix /nix</screen>
 
 </varlistentry>
   
+
+<varlistentry><term><envar>TMPDIR</envar></term>
+
+  <listitem><para>Use the specified directory to store temporary
+  files.  In particular, this includes temporary build directories;
+  these can take up substantial amounts of disk space.  The default is
+  <filename>/tmp</filename>.</para></listitem>
+  
+</varlistentry>
+
+
 </variablelist>
 
 </sect1>