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diff --git a/src/lingot-complex.h b/src/lingot-complex.h
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+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2011  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _LINGOT_COMPLEX_H_
+#define _LINGOT_COMPLEX_H_
+
+#include <math.h>
+#include "lingot-defs.h"
+
+// single complex arithmetic  :)
+
+typedef struct _LingotComplex LingotComplex;
+
+struct _LingotComplex
+  {
+    FLT r;
+    FLT i;
+  };
+
+void lingot_complex_add(LingotComplex* a, LingotComplex* b, LingotComplex* c);
+void lingot_complex_sub(LingotComplex* a, LingotComplex* b, LingotComplex* c);
+void lingot_complex_mul(LingotComplex* a, LingotComplex* b, LingotComplex* c);
+void lingot_complex_div(LingotComplex* a, LingotComplex* b, LingotComplex* c);
+
+#endif