diff --git a/Retron-77.md b/Retron-77.md
index 97ae48c..930eaab 100644
--- a/Retron-77.md
+++ b/Retron-77.md
@@ -37,7 +37,7 @@ Both an image of the included SD card and a tarball of the source and developmen
  * Glibc
  * Stella 3.7.5
 
-and several more support libraries.
+and several more support libraries. Apart from the dumper and the UI, all components are open source software.
 
 ## Components