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diff --git a/source/blender/geometry/GEO_mesh_merge_by_distance.hh b/source/blender/geometry/GEO_mesh_merge_by_distance.hh
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+++ b/source/blender/geometry/GEO_mesh_merge_by_distance.hh
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+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <optional>
+
+#include "BLI_index_mask.hh"
+#include "BLI_span.hh"
+
+struct Mesh;
+
+/** \file
+ * \ingroup geo
+ */
+
+namespace blender::geometry {
+
+/**
+ * Merge selected vertices into other selected vertices within the \a merge_distance. The merged
+ * indices favor speed over accuracy, since the results will depend on the order of the vertices.
+ *
+ * \returns std::nullopt if the mesh should not be changed (no vertices are merged), in order to
+ * avoid copying the input. Otherwise returns the new mesh with merged geoemetry.
+ */
+std::optional<Mesh *> mesh_merge_by_distance_all(const Mesh &mesh,
+                                                 IndexMask selection,
+                                                 float merge_distance);
+
+/**
+ * Merge selected vertices along edges to other selected vertices. Only vertices connected by edges
+ * are considered for merging.
+ *
+ * \returns std::nullopt if the mesh should not be changed (no vertices are merged), in order to
+ * avoid copying the input. Otherwise returns the new mesh with merged geoemetry.
+ */
+std::optional<Mesh *> mesh_merge_by_distance_connected(const Mesh &mesh,
+                                                       Span<bool> selection,
+                                                       float merge_distance,
+                                                       bool only_loose_edges);
+
+}  // namespace blender::geometry