diff --git a/README.md b/README.md
index 74a9779..7c5708f 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,10 @@ Upstream license, Creative Commons Attribution 4.0 International (CC BY 4.0).
 *Copyright © Gaurav Singh.*
 
 
+May contain components from upstream Altium libraries,
+which retain their upstream copyright.
+
+
 # Copyright
 Upstream sources under their respective copyrights.