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diff --git a/tools/buildman/README b/tools/buildman/README
index d688b7cf00..56a99c70a2 100644
--- a/tools/buildman/README
+++ b/tools/buildman/README
@@ -1046,6 +1046,16 @@ value for 'altbootcmd', but lost one for ' altbootcmd'.
The -U option uses the u-boot.env files which are produced by a build.
+
+Building with clang
+===================
+
+To build with clang (sandbox only), use the -O option to override the
+toolchain. For example:
+
+ buildman -O clang-7 --board sandbox
+
+
Other options
=============