diff --git a/extra/locals/backend/backend.factor b/extra/locals/backend/backend.factor
index 10bed8b5df..fd24631171 100644
--- a/extra/locals/backend/backend.factor
+++ b/extra/locals/backend/backend.factor
@@ -1,3 +1,5 @@
+! Copyright (C) 2008 Slava Pestov.
+! See http://factorcode.org/license.txt for BSD license.
 USING: math kernel slots.private inference.known-words
 inference.backend sequences effects words ;
 IN: locals.backend