diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 8a2aef417e..08d4a7cc13 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -234,8 +234,8 @@
                 <para>
                     The second example stops the build after all currently
                     executing tasks complete when the minimum disk space
-                    in the <filename>${TMPDIR}</filename> directory drops
-                    below 1 Gbyte.
+                    in the <filename>${<link linkend='var-TMPDIR'>TMPDIR</link>}</filename>
+                    directory drops below 1 Gbyte.
                     No disk monitoring occurs for the free inodes in this case.
                 </para>