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diff --git a/gladeui/glade-tsort.h b/gladeui/glade-tsort.h
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+/*
+ * glade-tsort.h: a topological sorting algorithm implementation
+ * 
+ * Copyright (C) 2013 Juan Pablo Ugarte.
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Authors:
+ *   Juan Pablo Ugarte <juanpablougarte@gmail.com>
+ */
+
+#ifndef __GLADE_TSORT_H__
+#define __GLADE_TSORT_H__
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+typedef struct __NodeEdge _NodeEdge;
+
+struct __NodeEdge
+{
+  gpointer predecessor;
+  gpointer successor;
+  _NodeEdge *next;
+};
+
+_NodeEdge *_node_edge_prepend  (_NodeEdge *node,
+                                gpointer predecessor,
+                                gpointer successor);
+
+void       _node_edge_free     (_NodeEdge *node);
+
+GList     *_glade_tsort        (GList     **nodes,
+                                _NodeEdge **edges);
+
+G_END_DECLS
+
+#endif /* __GLADE_TSORT_H__ */