diff --git a/doc/manual/advanced-topics/distributed-builds.xml b/doc/manual/advanced-topics/distributed-builds.xml
index 20fd6a0cfb0dde69da3cbf1a0842c2bc19f3cb94..bbb573e3540029fa0e9a86fd59e6dd0f5f1d5b82 100644
--- a/doc/manual/advanced-topics/distributed-builds.xml
+++ b/doc/manual/advanced-topics/distributed-builds.xml
@@ -81,6 +81,7 @@ or a newline, e.g.
 
 <para>Each machine specification consists of the following elements,
 separated by spaces. Only the first element is required.
+To leave a field at its default, set it to <literal>-</literal>.
 
 <orderedlist>