diff --git a/conclusions/LICENSE.txt b/conclusions/LICENSE.txt
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--- /dev/null
+++ b/conclusions/LICENSE.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright © 2024 Bastien Dumont
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/conclusions/README.md b/conclusions/README.md
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+++ b/conclusions/README.md
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+# Typographically distinguish conclusions from the surrounding text
+
+`conclusions` is a Lua filter for Pandoc
+that inserts blank spaces or headers before the conclusions.
+
+Conclusions must be wrapped in a div with a class `.ccl` or `.conclusion`
+and a `level` attribute corresponding to the level of the section to be closed.
+
+All configuration options have to be set in the YAML metadata block
+under the `conclusions` configuration variable:
+
+  * Headers will be inserted before conclusions
+    of level `innermost-level-header` or less.
+  * The title of these headers can be set with the variable
+    `ccl-explicit-titles` (a list of Markdown chunks).
+  * A vertical space will be inserted before conclusions
+    of level higher than `innermost-level-header`
+    down to `innermost-level-space`.
+
+An example can be found in `test.md`.
diff --git a/conclusions/conclusions.lua b/conclusions/conclusions.lua
new file mode 100644
index 0000000..e73109b
--- /dev/null
+++ b/conclusions/conclusions.lua
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+-- conclusions.lua
+-- A Pandoc Lua filter to distinguish conclusions from the surrounding text.
+-- Copyright 2024 Bastien Dumont (bastien.dumont [at] posteo.net)
+-- This file is under the MIT License: see LICENSE for more details
+
+local MAX_HEADER_LEVEL = 6
+
+local config = {
+  innermost_level_header = 2,
+  innermost_level_space = 3,
+  ccl_explicit_titles = {
+    'Conclusion de la partie',
+    'Conclusion du chapitre'
+  }
+}
+
+local function check_validity(key, value)
+  if key ~= 'ccl-explicit-titles'
+    and (value == nil or value < 1 or value > MAX_HEADER_LEVEL)
+  then
+    error(key .. ' must be a numeric value ' ..
+          'comprised between 1 and ' .. MAX_HEADER_LEVEL .. '.\n')
+  end
+end
+
+local function get_config(meta)
+  if meta.conclusions then
+    for key, value in pairs(meta.conclusions) do
+      if key ~= 'ccl-explicit-titles' then
+        value = math.tointeger(value[1].text)
+      end
+      check_validity(key, value)
+      config[string.gsub(key, '-', '_')] = value
+    end
+  end
+end
+
+local function set_raw_space()
+  local raw_space
+  if FORMAT == 'native' then
+    FORMAT = pandoc.system.environment().TESTED_FORMAT
+    set_raw_space()
+  elseif FORMAT == 'context' then
+    raw_space = pandoc.RawBlock('tex', '\\blank[big]')
+  elseif FORMAT == 'docx' then
+    raw_space = pandoc.RawBlock('openxml', '<w:p/>')
+  elseif  FORMAT == 'latex' then
+    raw_space = pandoc.RawBlock('tex', '\\bigskip')
+  else
+    error(FORMAT ..
+          ' output not supported by complex-paragraphs.lua\n')
+  end
+  return raw_space
+end
+
+local raw_space = set_raw_space()
+
+local function get_level(div)
+  local level = MAX_HEADER_LEVEL + 1
+  local set_value = div.attributes.level
+  if set_value then
+    set_value = math.tointeger(set_value)
+    check_validity('level', set_value)
+    level = set_value
+  else
+    io.stderr:write('level attribute missing to a div ' ..
+                    'with class conclusion or ccl, nothing done.\n')
+  end
+  return level
+end
+
+local function get_separator_as_list(level)
+  local separator = {}
+  if level <= config.innermost_level_header then
+    local header =
+      pandoc.Header(level + 1, config.ccl_explicit_titles[level])
+    table.insert(header.classes, 'unnumbered')
+    separator = { header }
+  elseif level <= config.innermost_level_space then
+    separator = { raw_space }
+  end
+  return separator
+end
+
+function Div(div)
+  local classes = div.classes
+  if classes:includes('conclusion')
+    or classes:includes('ccl')
+  then
+    local level = get_level(div)
+    local formatted_conclusion = get_separator_as_list(level)
+    table.insert(formatted_conclusion, div)
+    return formatted_conclusion
+  end
+end
+
+return {
+  { Meta = get_config },
+  { Div = Div }
+}
diff --git a/conclusions/test.md b/conclusions/test.md
new file mode 100644
index 0000000..232ebe6
--- /dev/null
+++ b/conclusions/test.md
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+---
+conclusions:
+  innermost-level-header: 3
+  innermost-level-space: 4
+  ccl-explicit-titles:
+    - "Conclusion of level 1"
+    - "Conclusion of level 2"
+    - "Conclusion of level 3"
+---
+
+# Title 1
+
+Text level 1
+
+## Title 1.1
+
+Text level 2
+
+### Title 1.1.1
+
+Text level 3
+
+#### Title 1.1.1.1
+
+Text level 4
+
+##### Title 1.1.1.1.1
+
+Text level 5
+
+###### Title 1.1.1.1.1.1
+
+Text level 6
+
+::: {.ccl level=6}
+My conclusion level 6
+:::
+
+::: {.ccl level=5}
+My conclusion level 5
+:::
+
+::: {.ccl level=4}
+My conclusion level 4
+:::
+
+::: {.ccl level=3}
+My conclusion level 3
+:::
+
+::: {.ccl level=2}
+My conclusion level 2
+:::
+
+::: {.ccl level=1}
+My conclusion level 1
+:::