diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 2d8d29a..e12ad12 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -11,7 +11,7 @@ Please, create an issue with `icon` label.
 Report a bug
 ------------
 
-Please, create an issue with `bug` and `generator` labels.
+Please, create an issue with `bug` label.
 
 Fix a typo in documentation
 ---------------------------
@@ -26,9 +26,15 @@ First of all, configure your workspace.
   * Install formatter, linter and test system: `pip install black flake8 pytest`.
   * Be sure to run `git config --local core.hooksPath data/githooks` to enable Git hooks.
 
+If you are using Pycharm, you may want to set up user dictionary as well:
+
+  * `cp data/dictionary.xml .idea/dictionaries/<user name>.xml`
+  * in `.idea/dictionaries/<user name>.xml` change `%USERNAME%` to your user name,
+  * restart Pycharm.
+
 ### Code style ###
 
-We use [Black](http://github.com/psf/black) code formatter with maximum 80 characters line lenght for all Python files within the project. Reformat a file is as simple as `black -l 80 <file name>`.
+We use [Black](http://github.com/psf/black) code formatter with maximum 80 characters line length for all Python files within the project. Reformat a file is as simple as `black -l 80 <file name>`.
 
 If you create new Python file, make sure you add `__author__ = "<first name> <second name>"` and `__email__ = "<author e-mail>"` string variables.
 
diff --git a/.gitignore b/.gitignore
index 9d28a3f..d667d03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,6 @@ dist/
 doc/*.html
 doc/*.svg
 doc/*.wiki
-missed_tags.yml
 out/
 
 # Cache
@@ -22,3 +21,6 @@ cache/
 
 work
 precommit.py
+
+venv
+.idea
diff --git a/data/githooks/commit-msg b/data/githooks/commit-msg
index 0316258..76600b9 100755
--- a/data/githooks/commit-msg
+++ b/data/githooks/commit-msg
@@ -1,4 +1,4 @@
-#!/usr/local/bin/python3
+#!/usr/bin/env python3
 """
 Commit message checking.
 """
diff --git a/data/githooks/pre-commit b/data/githooks/pre-commit
index 41ddc82..8d43f7a 100755
--- a/data/githooks/pre-commit
+++ b/data/githooks/pre-commit
@@ -13,5 +13,5 @@ echo "Lint with Flake8..."
 flake8 \
     --max-line-length=80 \
     --ignore=E203,W503,ANN002,ANN003,ANN101,ANN102 \
-    --exclude=work,python3.8 \
+    map_machine setup.py tests \
     || { echo "FAIL"; exit 1; }
diff --git a/doc/contributing.moi b/doc/contributing.moi
index 6c2cf63..7a9f4a7 100644
--- a/doc/contributing.moi
+++ b/doc/contributing.moi
@@ -12,7 +12,7 @@ Please, create an issue with \m {icon} label.
 
 \2 {Report a bug} {}
 
-Please, create an issue with \m {bug} and \m {generator} labels.
+Please, create an issue with \m {bug} label.
 
 \2 {Fix a typo in documentation} {}
 
@@ -26,8 +26,15 @@ First of all, configure your workspace.
     {Install formatter, linter and test system\: \m {pip install black flake8 pytest}.}
     {Be sure to run \m {git config --local core.hooksPath data/githooks} to enable Git hooks.}
 
+If you are using Pycharm, you may want to set up user dictionary as well:
+
+\list
+    {\m {cp data/dictionary.xml .idea/dictionaries/<user name>.xml}}
+    {in \m {.idea/dictionaries/<user name>.xml} change \m {%USERNAME%} to your user name,}
+    {restart Pycharm.}
+
 \3 {Code style} {code-style}
 
-We use \ref {http://github.com/psf/black} {Black} code formatter with maximum 80 characters line lenght for all Python files within the project.  Reformat a file is as simple as \m {black -l 80 \formal {file name}}.
+We use \ref {http://github.com/psf/black} {Black} code formatter with maximum 80 characters line length for all Python files within the project.  Reformat a file is as simple as \m {black -l 80 \formal {file name}}.
 
 If you create new Python file, make sure you add \m {__author__ = "\formal {first name} \formal {second name}"} and \m {__email__ = "\formal {author e-mail}"} string variables.
diff --git a/map_machine/color.py b/map_machine/color.py
index b6d96cd..0984aea 100644
--- a/map_machine/color.py
+++ b/map_machine/color.py
@@ -13,7 +13,7 @@ __email__ = "me@enzet.ru"
 
 def is_bright(color: Color) -> bool:
     """
-    Check whether color bright enough to have black outline instead of white.
+    Check whether color is bright enough to have black outline instead of white.
     """
     return (
         0.2126 * color.red + 0.7152 * color.green + 0.0722 * color.blue