diff --git a/lang/rust/files/patch-src_libbacktrace_fileline.c b/lang/rust/files/patch-src_libbacktrace_fileline.c
index 88e16025ddfc..2cdb2ac2cd93 100644
--- a/lang/rust/files/patch-src_libbacktrace_fileline.c
+++ b/lang/rust/files/patch-src_libbacktrace_fileline.c
@@ -1,3 +1,5 @@
+This file is in the public domain.
+
 --- src/libbacktrace/fileline.c.orig	2017-06-06 00:42:59 UTC
 +++ src/libbacktrace/fileline.c
 @@ -38,8 +38,39 @@ POSSIBILITY OF SUCH DAMAGE.  */