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diff --git a/tools/buildman/README b/tools/buildman/README
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@@ -108,6 +108,15 @@ behaviour is a superset of exact or substring matching. Examples are:
* '^tegra[23]0$' All boards with either Tegra20 or Tegra30 SoC
* 'powerpc' All PowerPC boards
+While the default is to OR the terms together, you can also make use of
+the '&' operator to limit the selection:
+
+* 'freescale & arm sandbox' All Freescale boards with ARM architecture,
+ plus sandbox
+
+It is convenient to use the -n option to see whaat will be built based on
+the subset given.
+
Buildman does not store intermediate object files. It optionally copies
the binary output into a directory when a build is successful. Size
information is always recorded. It needs a fair bit of disk space to work,