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-rw-r--r--rust/proc-macro2/probe/proc_macro_span.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/rust/proc-macro2/probe/proc_macro_span.rs b/rust/proc-macro2/probe/proc_macro_span.rs
index 2d7d44e07708..892a7eb3e5a0 100644
--- a/rust/proc-macro2/probe/proc_macro_span.rs
+++ b/rust/proc-macro2/probe/proc_macro_span.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
// This code exercises the surface area that we expect of Span's unstable API.
// If the current toolchain is able to compile it, then proc-macro2 is able to
// offer these APIs too.