diff --git a/lib/src/phy/fec/utils_avx2.h b/lib/src/phy/fec/utils_avx2.h
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index 000000000..5baaf3e40
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+++ b/lib/src/phy/fec/utils_avx2.h
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+/*
+ * Copyright 2013-2020 Software Radio Systems Limited
+ *
+ * This file is part of srsLTE.
+ *
+ * srsLTE is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * srsLTE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * A copy of the GNU Affero General Public License can be found in
+ * the LICENSE file in the top-level directory of this distribution
+ * and at http://www.gnu.org/licenses/.
+ *
+ */
+
+/*!
+ * \file utils_avx2.h
+ * \brief Declarations of AVX2-related quantities and functions.
+ * \author David Gregoratti (CTTC)
+ * \date 2020
+ *
+ * \copyright Software Radio Systems Limited
+ *
+ */
+
+#ifndef SRSLTE_UTILS_AVX2_H
+#define SRSLTE_UTILS_AVX2_H
+
+#define SRSLTE_AVX2_B_SIZE 32    /*!< \brief Number of packed bytes in an AVX2 instruction. */
+#define SRSLTE_AVX2_B_SIZE_LOG 5 /*!< \brief \f$\log_2\f$ of \ref SRSLTE_AVX2_B_SIZE. */
+
+#endif // SRSLTE_UTILS_AVX2_H