diff --git a/roentgen/moire_manager.py b/roentgen/moire_manager.py
new file mode 100644
index 0000000..8730f9b
--- /dev/null
+++ b/roentgen/moire_manager.py
@@ -0,0 +1,159 @@
+"""
+Moire markup extension for Röntgen.
+"""
+import argparse
+from abc import ABC
+
+from moire.moire import Tag
+from moire.default import Default, DefaultMarkdown
+
+from pathlib import Path
+from typing import Dict, List, Any
+import yaml
+
+from roentgen.ui import add_render_arguments
+
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
+Arguments = List[Any]
+
+PREFIX: str = "https://wiki.openstreetmap.org/wiki/"
+
+
+class ArgumentParser(argparse.ArgumentParser):
+    """
+    Argument parser that stores arguments and creates help in Moire markup.
+    """
+
+    def __init__(self, *args, **kwargs):
+        self.arguments = []
+        super(ArgumentParser, self).__init__(*args, **kwargs)
+
+    def add_argument(self, *args, **kwargs) -> None:
+        """Just store argument with options."""
+        super(ArgumentParser, self).add_argument(*args, **kwargs)
+        argument: Dict[str, Any] = {"arguments": [x for x in args]}
+
+        for key in kwargs:
+            argument[key] = kwargs[key]
+
+        self.arguments.append(argument)
+
+    def get_moire_help(self) -> Tag:
+        """Return Moire table with stored arguments."""
+        table = [[["Option"], ["Description"]]]
+
+        for option in self.arguments:
+            array = [[Tag("tt", [x]), ", "] for x in option["arguments"]]
+            row = [[x for y in array for x in y][:-1]]
+
+            if "help" in option:
+                help_value: str = option["help"]
+                if "default" in option and option["default"] != "==SUPPRESS==":
+                    help_value += (
+                        f", default value: \\tt {{{option['default']}}}"
+                    )
+                row.append([help_value])
+            else:
+                row.append([])
+            table.append(row)
+        return Tag("table", table)
+
+
+class TestConfiguration:
+    """
+    GitHub Actions test configuration.
+    """
+
+    def __init__(self, test_config: Path):
+        self.steps: Dict[str, Any] = {}
+
+        with test_config.open() as input_file:
+            content: Dict[str, Any] = yaml.load(
+                input_file, Loader=yaml.FullLoader
+            )
+            steps: List[Dict[str, Any]] = content["jobs"]["build"]["steps"]
+            for step in steps:
+                if "name" not in step:
+                    continue
+                self.steps[step["name"]] = step
+
+    def get_command(self, name: str) -> str:
+        """Get shell script commands for the test."""
+        return self.steps[name]["run"].strip()
+
+
+test_configuration: TestConfiguration = TestConfiguration(
+    Path(".github/workflows/test.yml")
+)
+
+
+def osm(converter: Default, args: Arguments) -> str:
+    """OSM tag key or key–value pair of tag."""
+    spec: str = converter.clear(args[0])
+    if "=" in spec:
+        key, tag = spec.split("=")
+        return (
+            converter.get_href_(f"{PREFIX}Key:{key}", converter.tt([key]))
+            + "="
+            + converter.get_href_(
+                f"{PREFIX}Tag:{key}={tag}", converter.tt([tag])
+            )
+        )
+    else:
+        return converter.get_href_(f"{PREFIX}Key:{spec}", converter.tt([spec]))
+
+
+class RoentgenMoire(Default, ABC):
+    """
+    Moire extension stub for Röntgen.
+    """
+
+    def osm(self, args: Arguments) -> str:
+        """OSM tag key or key–value pair of tag."""
+        raise NotImplementedError
+
+    def color(self, args: Arguments) -> str:
+        """Simple color sample."""
+        raise NotImplementedError
+
+
+class RoentgenMarkdown(RoentgenMoire, DefaultMarkdown):
+    """
+    GitHub flavored markdown.
+    """
+
+    images = {}
+
+    def osm(self, args: Arguments) -> str:
+        """OSM tag key or key–value pair of tag."""
+        return osm(self, args)
+
+    def color(self, args: Arguments) -> str:
+        """Simple color sample."""
+        return self.clear(args[0])
+
+    def icon(self, args: Arguments) -> str:
+        """Image with Röntgen icon."""
+        return f"[{self.clear(args[0])}]"
+
+    def command(self, args: Arguments) -> str:
+        """
+        Bash command from GitHub Actions configuration.
+
+        See .github/workflows/test.yml
+        """
+        return test_configuration.get_command(self.clear(args[0]))
+
+    def options(self, args: Arguments) -> str:
+        """Table with option descriptions."""
+        parser: ArgumentParser = ArgumentParser()
+        command: str = self.clear(args[0])
+        if command == "render":
+            add_render_arguments(parser)
+        else:
+            raise NotImplementedError(
+                "no separate function for render creation"
+            )
+        return self.parse(parser.get_moire_help())