diff --git a/Makefile b/Makefile
index 26efb1ba7..34a74a8e4 100644
--- a/Makefile
+++ b/Makefile
@@ -76,8 +76,11 @@ inbox-xml: $(OUTDIR)/inbox $(proto_xep_xmls)
 .PHONY: pdf
 pdf: $(xep_pdfs)
 
+$(REFSDIR)/LICENSE: refs-LICENSE
+	cp $< $@
+
 .PHONY: refs
-refs: $(xep_refs)
+refs: $(xep_refs) $(REFSDIR)/LICENSE
 
 .PHONY: examples
 examples: $(xep_examples)
diff --git a/refs-LICENSE b/refs-LICENSE
new file mode 100644
index 000000000..f509271a6
--- /dev/null
+++ b/refs-LICENSE
@@ -0,0 +1,5 @@
+The bibliopgrahic data available, which is also accessible via
+https://xmpp.org/extensions/refs/, is available openly and free of
+charge under the CC BY-ND 4.0 [1] license.
+
+1: https://creativecommons.org/licenses/by-nd/4.0/