diff --git a/dosp-survey.ltx b/dosp-survey.ltx
index 9b2a248aa6f209a2fca3654fe970be9211f86ec5..02c7c278b75ed1bbeb6d12acd3193eafb07fab5e 100644
--- a/dosp-survey.ltx
+++ b/dosp-survey.ltx
@@ -432,5 +432,6 @@ a core example of DOSP.
 \numberedsection{Acknowledgements}\label{acknowledgements-sow}
 
 TBD
+% Two examples learned from https://blog.adamretter.org.uk/business-source-license-adoption/
 
 \BLOCK{endblock}