diff --git a/roentgen/constructor.py b/roentgen/constructor.py
index d1234d7..3fee833 100644
--- a/roentgen/constructor.py
+++ b/roentgen/constructor.py
@@ -1,6 +1,7 @@
 """
 Construct Röntgen nodes and ways.
 """
+import logging
 from datetime import datetime
 from hashlib import sha256
 from typing import Any, Dict, Iterator, List, Optional, Set
@@ -17,9 +18,7 @@ from roentgen.flinger import Flinger
 from roentgen.icon import (
     DEFAULT_SMALL_SHAPE_ID, Icon, IconSet, ShapeExtractor, ShapeSpecification
 )
-from roentgen.osm_reader import (
-    Map, OSMMember, OSMNode, OSMRelation, OSMWay, Tagged
-)
+from roentgen.osm_reader import Map, OSMNode, OSMRelation, OSMWay, Tagged
 from roentgen.point import Point
 from roentgen.scheme import DEFAULT_COLOR, LineStyle, Scheme
 from roentgen.util import MinMax
@@ -48,7 +47,7 @@ def line_center(nodes: List[OSMNode], flinger: Flinger) -> np.array:
     """
     boundary: List[MinMax] = [MinMax(), MinMax()]
 
-    for node in nodes:  # type: OSMNode
+    for node in nodes:
         boundary[0].update(node.coordinates[0])
         boundary[1].update(node.coordinates[1])
     center_coordinates = np.array((boundary[0].center(), boundary[1].center()))
@@ -84,7 +83,7 @@ def glue(ways: List[OSMWay]) -> List[List[OSMNode]]:
     result: List[List[OSMNode]] = []
     to_process: Set[OSMWay] = set()
 
-    for way in ways:  # type: OSMWay
+    for way in ways:
         if way.is_cycle():
             result.append(way.nodes)
         else:
@@ -95,7 +94,7 @@ def glue(ways: List[OSMWay]) -> List[List[OSMNode]]:
         glued: Optional[OSMWay] = None
         other_way: Optional[OSMWay] = None
 
-        for other_way in to_process:  # type: OSMWay
+        for other_way in to_process:
             glued = way.try_to_glue(other_way)
             if glued:
                 break
@@ -170,7 +169,7 @@ class Constructor:
         Construct Röntgen ways.
         """
         way_number: int = 0
-        for way_id in self.map_.ways:  # type: int
+        for way_id in self.map_.ways:
             ui.progress_bar(
                 way_number,
                 len(self.map_.ways),
@@ -226,7 +225,7 @@ class Constructor:
             self.roads.append(Road(line.tags, inners, outers, road_matcher))
             return
 
-        for line_style in line_styles:  # type: LineStyle
+        for line_style in line_styles:
             self.figures.append(
                 StyledFigure(line.tags, inners, outers, line_style)
             )
@@ -308,7 +307,7 @@ class Constructor:
                 continue
             inner_ways: List[OSMWay] = []
             outer_ways: List[OSMWay] = []
-            for member in relation.members:  # type: OSMMember
+            for member in relation.members:
                 if member.type_ == "way":
                     if member.role == "inner":
                         if member.ref in self.map_.ways:
@@ -317,7 +316,7 @@ class Constructor:
                         if member.ref in self.map_.ways:
                             outer_ways.append(self.map_.ways[member.ref])
                     else:
-                        print(f'Unknown member role "{member.role}".')
+                        logging.warning(f'Unknown member role "{member.role}".')
             if outer_ways:
                 inners_path: List[List[OSMNode]] = glue(inner_ways)
                 outers_path: List[List[OSMNode]] = glue(outer_ways)
@@ -334,7 +333,7 @@ class Constructor:
             key=lambda x: -self.map_.nodes[x].coordinates[0],
         )
 
-        for node_id in sorted_node_ids:  # type: int
+        for node_id in sorted_node_ids:
             processed: Set[str] = set()
 
             node_number += 1
diff --git a/roentgen/figure.py b/roentgen/figure.py
index 3679748..bdbbbb0 100644
--- a/roentgen/figure.py
+++ b/roentgen/figure.py
@@ -7,6 +7,9 @@ from roentgen.osm_reader import OSMNode, Tagged
 from roentgen.road import Lane
 from roentgen.scheme import LineStyle, RoadMatcher, Scheme
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 class Figure(Tagged):
     """
@@ -182,7 +185,7 @@ def is_clockwise(polygon: List[OSMNode]) -> bool:
     :param polygon: list of OpenStreetMap nodes
     """
     count: float = 0
-    for index, node in enumerate(polygon):  # type: int, OSMNode
+    for index, node in enumerate(polygon):
         next_index: int = 0 if index == len(polygon) - 1 else index + 1
         count += (polygon[next_index].coordinates[0] - node.coordinates[0]) * (
             polygon[next_index].coordinates[1] + node.coordinates[1]
@@ -214,7 +217,7 @@ def get_path(nodes: List[OSMNode], shift: np.array, flinger: Flinger) -> str:
     """
     path: str = ""
     prev_node: Optional[OSMNode] = None
-    for node in nodes:  # type: OSMNode
+    for node in nodes:
         flung = flinger.fling(node.coordinates) + shift
         path += ("L" if prev_node else "M") + f" {flung[0]},{flung[1]} "
         prev_node = node
diff --git a/roentgen/icon.py b/roentgen/icon.py
index 6e5707d..34a9b5d 100644
--- a/roentgen/icon.py
+++ b/roentgen/icon.py
@@ -7,7 +7,7 @@ import re
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any, Dict, List, Optional, Set
-from xml.dom.minidom import Document, Element, Node, parse
+from xml.dom.minidom import Document, Element, parse
 
 import numpy as np
 import svgwrite
@@ -183,10 +183,10 @@ class ShapeExtractor:
         )
         with svg_file_name.open() as input_file:
             content: Document = parse(input_file)
-            for element in content.childNodes:  # type: Element
+            for element in content.childNodes:
                 if element.nodeName != "svg":
                     continue
-                for node in element.childNodes:  # type: Node
+                for node in element.childNodes:
                     if isinstance(node, Element):
                         self.parse(node)
 
diff --git a/roentgen/mapcss.py b/roentgen/mapcss.py
index 51bbe7d..358d604 100644
--- a/roentgen/mapcss.py
+++ b/roentgen/mapcss.py
@@ -13,6 +13,9 @@ from roentgen.icon import ShapeExtractor
 from roentgen.osm_reader import STAGES_OF_DECAY
 from roentgen.scheme import Scheme, Matcher
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 class MapCSSWriter:
     def __init__(
@@ -71,7 +74,7 @@ class MapCSSWriter:
 
         return selector
 
-    def write(self, output_file) -> None:
+    def write(self, output_file: Path) -> None:
         """
         Construct icon selectors for MapCSS 0.2 scheme.
         """
diff --git a/roentgen/mapper.py b/roentgen/mapper.py
index de05624..7f5cc76 100644
--- a/roentgen/mapper.py
+++ b/roentgen/mapper.py
@@ -17,7 +17,7 @@ from roentgen.figure import Road
 from roentgen.flinger import Flinger
 from roentgen.icon import ShapeExtractor
 from roentgen.osm_reader import Map, OSMNode
-from roentgen.point import Occupied, Point
+from roentgen.point import Occupied
 from roentgen.road import Intersection, RoadPart
 from roentgen.scheme import Scheme
 
@@ -100,7 +100,7 @@ class Painter:
         nodes = sorted(constructor.points, key=lambda x: -x.priority)
         steps: int = len(nodes)
 
-        for index, node in enumerate(nodes):  # type: int, Point
+        for index, node in enumerate(nodes):
             if node.get_tag("natural") == "tree" and (
                 "diameter_crown" in node.tags or "circumference" in node.tags
             ):
@@ -110,13 +110,13 @@ class Painter:
             )
             node.draw_main_shapes(self.svg, occupied)
 
-        for index, point in enumerate(nodes):  # type: int, Point
+        for index, point in enumerate(nodes):
             ui.progress_bar(
                 steps + index, steps * 3, step=10, text="Drawing extra icons"
             )
             point.draw_extra_shapes(self.svg, occupied)
 
-        for index, point in enumerate(nodes):  # type: int, Point
+        for index, point in enumerate(nodes):
             ui.progress_bar(
                 steps * 2 + index, steps * 3, step=10, text="Drawing texts"
             )
@@ -181,7 +181,7 @@ class Painter:
             )
             building_shade.add(path)
             for nodes in building.inners + building.outers:
-                for i in range(len(nodes) - 1):  # type: int
+                for i in range(len(nodes) - 1):
                     flung_1 = self.flinger.fling(nodes[i].coordinates)
                     flung_2 = self.flinger.fling(nodes[i + 1].coordinates)
                     command = (
@@ -260,7 +260,7 @@ class Painter:
         """
         Draw gradient sectors for directions.
         """
-        for node in constructor.points:  # type: Point
+        for node in constructor.points:
 
             angle = None
             is_revert_gradient: bool = False
diff --git a/roentgen/raster.py b/roentgen/raster.py
index 8a96a81..6f77424 100644
--- a/roentgen/raster.py
+++ b/roentgen/raster.py
@@ -3,6 +3,9 @@ import subprocess
 from pathlib import Path
 from typing import List
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 def rasterize(from_: Path, to_: Path, area: str = "", dpi: float = 90) -> None:
     """
diff --git a/roentgen/road.py b/roentgen/road.py
index f41a1ce..4a8edb5 100644
--- a/roentgen/road.py
+++ b/roentgen/road.py
@@ -11,6 +11,9 @@ from roentgen.flinger import Flinger
 from roentgen.osm_reader import OSMNode
 from roentgen.vector import Line, angle, norm, turn_by_angle
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 @dataclass
 class Lane:
diff --git a/roentgen/scheme.py b/roentgen/scheme.py
index 31f835f..7066826 100644
--- a/roentgen/scheme.py
+++ b/roentgen/scheme.py
@@ -303,7 +303,7 @@ class Scheme:
         """
         if key in self.tags_to_write or key in self.tags_to_skip:
             return True
-        for prefix in self.prefix_to_write + self.prefix_to_skip:  # type: str
+        for prefix in self.prefix_to_write + self.prefix_to_skip:
             if key[: len(prefix) + 1] == f"{prefix}:":
                 return True
         return False
@@ -319,7 +319,7 @@ class Scheme:
             return False
         if key in self.tags_to_write:
             return True
-        for prefix in self.prefix_to_write:  # type: str
+        for prefix in self.prefix_to_write:
             if key[: len(prefix) + 1] == f"{prefix}:":
                 return True
         return False
diff --git a/roentgen/server.py b/roentgen/server.py
index 51ef870..b518896 100644
--- a/roentgen/server.py
+++ b/roentgen/server.py
@@ -7,6 +7,9 @@ from roentgen.workspace import workspace
 from roentgen.raster import rasterize
 from roentgen.tile import Tile
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 class Handler(BaseHTTPRequestHandler):
 
diff --git a/roentgen/tile.py b/roentgen/tile.py
index 7d05dad..431c1f8 100644
--- a/roentgen/tile.py
+++ b/roentgen/tile.py
@@ -24,6 +24,9 @@ from roentgen.scheme import Scheme
 from roentgen.util import MinMax
 from roentgen.ui import BoundaryBox
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 @dataclass
 class Tiles:
@@ -267,7 +270,7 @@ class Tile:
         )
         painter.draw(constructor)
 
-        print(f"Writing output SVG {output_file_name}...")
+        logging.info(f"Writing output SVG {output_file_name}...")
         with output_file_name.open("w") as output_file:
             svg.write(output_file)
 
@@ -301,5 +304,7 @@ def ui(options) -> None:
         tiles.draw(directory, Path(options.cache))
         tiles.draw_image(Path(options.cache))
     else:
-        logging.fatal("Specify either --coordinates, or --tile.")
+        logging.fatal(
+            "Specify either --coordinates, --boundary-box, or --tile."
+        )
         sys.exit(1)
diff --git a/roentgen/vector.py b/roentgen/vector.py
index bfa00ce..4ed14d4 100644
--- a/roentgen/vector.py
+++ b/roentgen/vector.py
@@ -3,6 +3,9 @@ Vector utility.
 """
 import numpy as np
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 def angle(vector: np.array):
     """
diff --git a/roentgen/workspace.py b/roentgen/workspace.py
index fc5c919..ceae402 100644
--- a/roentgen/workspace.py
+++ b/roentgen/workspace.py
@@ -3,6 +3,9 @@ File and directory path in the project.
 """
 from pathlib import Path
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 def check_and_create(directory: Path) -> Path:
     """Create directory if it doesn't exist and return it."""