diff --git a/Makefile b/Makefile
index 8bb5986..dc326eb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,2 @@
 cleanup:
-	bibtool -s -r biblatex -r swhbibrsc < swh.bib | sponge swh.bib
+	bibtool -r biblatex -r swhbibrsc < swh.bib | sponge swh.bib
diff --git a/README b/README
index fbf1bce..fa98f78 100644
--- a/README
+++ b/README
@@ -1,4 +1,7 @@
 In order to maintain consistent formatting, after each addition please run
-bibtool -s -r biblatex -r swhbibrsc < swh.bib | sponge swh.bib
+bibtool -r biblatex -r swhbibrsc < swh.bib | sponge swh.bib
 or simply, type make
 
+Warining: make sure the @proceedings entries are all at the end of the file, as
+crossref keys only work when @proceedings entries follow the entry that refers
+to them.