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-rw-r--r--src/main/proto/firrtl.proto2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/main/proto/firrtl.proto b/src/main/proto/firrtl.proto
index b4c8f36d..e8451d7a 100644
--- a/src/main/proto/firrtl.proto
+++ b/src/main/proto/firrtl.proto
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0
+
syntax = "proto3";
package firrtl;