diff --git a/debian/copyright b/debian/copyright
index 904520080..d237c5ece 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -1299,6 +1299,9 @@ License: OFL-1.1
  FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
  OTHER DEALINGS IN THE FONT SOFTWARE.
 
+License: public-domain
+ This software has been placed into the public domain by its authors.
+
 License: Zlib
  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages