diff --git a/README b/README
index 65942bd..fbf1bce 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
 In order to maintain consistent formatting, after each addition please run
-bibtool -r biblatex -r swhbibrsc < swh.bib | sponge swh.bib
+bibtool -s -r biblatex -r swhbibrsc < swh.bib | sponge swh.bib
 or simply, type make