News: Added a news item for the new BuildBox sandbox
diff --git a/NEWS b/NEWS
index 2fabe0c..5d59065 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,10 @@
 buildstream 1.3.1
 =================
 
+  o Added Basic support for the BuildBox sandbox. The sand box will only be used if the
+    environment variable BST_FORCE_SANDBOX is set to `buildbox`. This is the first step in
+    transitioning to only using BuildBox for local sandboxing.
+
   o BREAKING CHANGE: The yaml API has been rewritten entirely. When accessing
     configuration from YAML, please use the new `Node` classes exposed in the
     `buildstream` package. See the documentation for how to use it.