diff --git a/nodes/modifier_change/extrude_region.py b/nodes/modifier_change/extrude_region.py
index 08497fb869..5cffaf3896 100644
--- a/nodes/modifier_change/extrude_region.py
+++ b/nodes/modifier_change/extrude_region.py
@@ -219,6 +219,7 @@ def process(self):
             if face_data:
                 face_data_matched = repeat_last_for_length(face_data, len(faces))
 
+            # see: https://github.com/nortikin/sverchok/pull/4999#issuecomment-1734256435
             need_fake_face = True
             loops = [[faces]]
             if need_fake_face:
@@ -307,6 +308,7 @@ def process(self):
 
                 extrude_geom = new_geom
 
+            # see: https://github.com/nortikin/sverchok/pull/4999#issuecomment-1734256435
             if need_fake_face:
                 for loop in loops:
                     bm.verts.ensure_lookup_table()
diff --git a/nodes/modifier_change/mesh_separate.py b/nodes/modifier_change/mesh_separate.py
index e756bee198..c5d77ad8cb 100644
--- a/nodes/modifier_change/mesh_separate.py
+++ b/nodes/modifier_change/mesh_separate.py
@@ -48,50 +48,6 @@ def process(self):
         verts_out = []
         poly_edge_out = []
         for ve, pe in zip_long_repeat(verts, poly):
-            # # build links
-            # node_links = {}
-            # for edge_face in pe:
-            #     for i in edge_face:
-            #         if i not in node_links:
-            #             node_links[i] = set()
-            #         node_links[i].update(edge_face)
-
-            # nodes = set(node_links.keys())
-            # n = nodes.pop()
-            # node_set_list = [set([n])]
-            # node_stack = collections.deque()
-            # node_stack_append = node_stack.append
-            # node_stack_pop = node_stack.pop
-            # node_set = node_set_list[-1]
-            # # find separate sets
-            # while nodes:
-            #     for node in node_links[n]:
-            #         if node not in node_set:
-            #             node_stack_append(node)
-            #     if not node_stack:  # new mesh part
-            #         n = nodes.pop()
-            #         node_set_list.append(set([n]))
-            #         node_set = node_set_list[-1]
-            #     else:
-            #         while node_stack and n in node_set:
-            #             n = node_stack_pop()
-            #         nodes.discard(n)
-            #         node_set.add(n)
-            # # create new meshes from sets, new_pe is the slow line.
-            # if len(node_set_list) > 1:
-            #     for node_set in node_set_list:
-            #         mesh_index = sorted(node_set)
-            #         vert_dict = {j: i for i, j in enumerate(mesh_index)}
-            #         new_vert = [ve[i] for i in mesh_index]
-            #         new_pe = [[vert_dict[n] for n in fe]
-            #                   for fe in pe
-            #                   if fe[0] in node_set]
-            #         verts_out.append(new_vert)
-            #         poly_edge_out.append(new_pe)
-            # elif node_set_list:  # no reprocessing needed
-            #     verts_out.append(ve)
-            #     poly_edge_out.append(pe)
-
             vo, po, _ = separate_loose_mesh(ve, pe)
             verts_out.extend(vo)
             poly_edge_out.extend(po)
diff --git a/utils/mesh/separate_loose_mesh.py b/utils/mesh/separate_loose_mesh.py
index 1c7527170c..acd0242d70 100644
--- a/utils/mesh/separate_loose_mesh.py
+++ b/utils/mesh/separate_loose_mesh.py
@@ -25,6 +25,15 @@
 from sverchok.utils.nodes_mixins.sockets_config import ModifierLiteNode
 
 def separate_loose_mesh(verts_in, poly_edge_in):
+        ''' separate a mesh by loose parts.
+        input:
+          1. list of verts
+          2. list of edges/polygons
+        output: list of
+          1. separated list of verts
+          2. separated list of edges/polygons with new indices of separated elements
+          3. separated list of edges/polygons (like 2) with old indices
+        '''
         verts_out = []
         poly_edge_out = []
         poly_edge_old_indexes_out = []  # faces with old indices