diff --git a/appendix_license_notices.asciidoc b/appendix_license_notices.asciidoc
index c6beb95..5ae9fce 100644
--- a/appendix_license_notices.asciidoc
+++ b/appendix_license_notices.asciidoc
@@ -2,7 +2,7 @@
 [[sources_licenses]]
 == Sources and License Notices
 
-This appendix contains attribution and license notices for material included by permission granted via open licenses.
+This appendix contains attribution and license notices for material included by permission or granted via an open license.
 
 === Sources