diff --git a/README.md b/README.md
index ad531a44d0d8690173d58b9b2325513308122660..c883cf44b439b2dc7fb7f002d5dd9ceb1b91aa5d 100644
--- a/README.md
+++ b/README.md
@@ -35,3 +35,4 @@ for Spack is also available.
 Authors
 ----------------
 Spack was written by Todd Gamblin, tgamblin@llnl.gov.
+LLNL-CODE-647188