diff --git a/README.md b/README.md
index abd8fdb7..72e6d238 100644
--- a/README.md
+++ b/README.md
@@ -17,4 +17,5 @@ Further development requires Android Studio.
 ## License
 
 Privacy Friendly Sudoku is lisenced under the GPLv3.
+The icons ic_trophy_award_black_48dp and ic_trophy_black_48dp are licensed under the Sil Open Font License Version 1.1.