diff --git a/fips202/fips202x.c b/fips202/fips202x.c
index 2564c024d..65df69252 100644
--- a/fips202/fips202x.c
+++ b/fips202/fips202x.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: Apache-2.0
 #include <string.h>
 #include "fips202x.h"
 #include "fips202.h"
diff --git a/fips202/fips202x.h b/fips202/fips202x.h
index 75a81e2bd..9e1809a4b 100644
--- a/fips202/fips202x.h
+++ b/fips202/fips202x.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: Apache-2.0
 #ifndef FIPS_202X_H
 #define FIPS_202X_H