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diff --git a/src/helper/geom-nodetype.h b/src/helper/geom-nodetype.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_HELPER_GEOM_NODETYPE_H
+#define INKSCAPE_HELPER_GEOM_NODETYPE_H
+
+/**
+ * @file
+ * Specific nodetype geometry functions for Inkscape, not provided my lib2geom.
+ */
+/*
+ * Author:
+ *   Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/forward.h>
+
+namespace Geom {
+
+/**
+ *  What kind of node is this?  This is the value for the node->type
+ *  field.  NodeType indicates the degree of continuity required for
+ *  the node.  I think that the corresponding integer indicates which
+ *  derivate is connected. (Thus 2 means that the node is continuous
+ *  to the second derivative, i.e. has matching endpoints and tangents)
+ */
+enum NodeType {
+/**  Discontinuous node, usually either start or endpoint of a path */
+    NODE_NONE,
+/**  This node continuously joins two segments, but the unit tangent is discontinuous.*/
+    NODE_CUSP,
+/**  This node continuously joins two segments, with continuous *unit* tangent. */
+    NODE_SMOOTH,
+/**  This node is symmetric. I.e. continuously joins two segments with continuous derivative */
+    NODE_SYMM
+};
+
+
+NodeType get_nodetype(Curve const &c_incoming, Curve const &c_outgoing);
+
+
+} // namespace Geom
+
+#endif  // INKSCAPE_HELPER_GEOM_NODETYPE_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :