diff --git a/aiogram/utils/context.py b/aiogram/utils/context.py
index dfef6882..b31c71c0 100644
--- a/aiogram/utils/context.py
+++ b/aiogram/utils/context.py
@@ -1,5 +1,5 @@
 """
-Need setup task factory:
+You need to setup task factory:
     >>> from aiogram.utils import context
     >>> loop = asyncio.get_event_loop()
     >>> loop.set_task_factory(context.task_factory)
diff --git a/aiogram/utils/executor.py b/aiogram/utils/executor.py
index b1fec35e..ed8947eb 100644
--- a/aiogram/utils/executor.py
+++ b/aiogram/utils/executor.py
@@ -51,7 +51,8 @@ def start_pooling(*args, **kwargs):
     return start_polling(*args, **kwargs)
 
 
-def start_polling(dispatcher, *, loop=None, skip_updates=False, on_startup=None, on_shutdown=None):
+def start_polling(dispatcher, *, loop=None, skip_updates=False,
+                  on_startup=None, on_shutdown=None):
     log.warning('Start bot with long-polling.')
     if loop is None:
         loop = dispatcher.loop
@@ -59,7 +60,7 @@ def start_polling(dispatcher, *, loop=None, skip_updates=False, on_startup=None,
     loop.set_task_factory(context.task_factory)
 
     try:
-        loop.run_until_complete(_startup(dispatcher, skip_updates=skip_updates, callback=on_startup))
+        loop.run_until_complete(_startup(dispatcher, skip_updates, on_startup))
         loop.create_task(dispatcher.start_polling(reset_webhook=True))
         loop.run_forever()
     except (KeyboardInterrupt, SystemExit):
@@ -69,8 +70,8 @@ def start_polling(dispatcher, *, loop=None, skip_updates=False, on_startup=None,
     log.warning("Goodbye!")
 
 
-def start_webhook(dispatcher, webhook_path, *, loop=None, skip_updates=None, on_startup=None, on_shutdown=None,
-                  check_ip=False, **kwargs):
+def start_webhook(dispatcher, webhook_path, *, loop=None, skip_updates=None,
+                  on_startup=None, on_shutdown=None, check_ip=False, **kwargs):
     log.warning('Start bot with webhook.')
     if loop is None:
         loop = dispatcher.loop
diff --git a/aiogram/utils/helper.py b/aiogram/utils/helper.py
index 5b708f18..eeabca7c 100644
--- a/aiogram/utils/helper.py
+++ b/aiogram/utils/helper.py
@@ -137,7 +137,8 @@ class Item:
     """
     Helper item
 
-    If value is not configured it will be generated automatically based on variable name
+    If a value is not provided,
+    it will be automatically generated based on a variable's name
     """
 
     def __init__(self, value=None):
@@ -156,7 +157,7 @@ class Item:
 
 class ListItem(Item):
     """
-    This item always is list
+    This item is always a list
 
     You can use &, | and + operators for that.
     """
@@ -179,7 +180,7 @@ class ItemsList(list):
     """
     Patch for default list
 
-    This class provide +, &, |, +=, &=, |= operators for extending the list
+    This class provides +, &, |, +=, &=, |= operators for extending the list
     """
 
     def __init__(self, *seq):
diff --git a/aiogram/utils/markdown.py b/aiogram/utils/markdown.py
index da08a400..1e64c106 100644
--- a/aiogram/utils/markdown.py
+++ b/aiogram/utils/markdown.py
@@ -18,6 +18,8 @@ HTML_QUOTES_MAP = {
     '"': '"'
 }
 
+_HQS = HTML_QUOTES_MAP.keys()  # HQS for HTML QUOTES SYMBOLS
+
 
 def _join(*content, sep=' '):
     return sep.join(map(str, content))
@@ -38,21 +40,22 @@ def quote_html(content):
     """
     Quote HTML symbols
 
-    All <, > and & symbols that are not a part of a tag or an HTML entity
-    must be replaced with the corresponding HTML entities (< with &lt;, > with &gt; and & with &amp;).
+    All <, >, & and " symbols that are not a part of a tag or
+    an HTML entity must be replaced with the corresponding HTML entities
+    (< with &lt; > with &gt; & with &amp and " with &quot).
 
     :param content: str
     :return: str
     """
     new_content = ''
     for symbol in content:
-        new_content += HTML_QUOTES_MAP[symbol] if symbol in '<>&"' else symbol
+        new_content += HTML_QUOTES_MAP[symbol] if symbol in _HQS else symbol
     return new_content
 
 
 def text(*content, sep=' '):
     """
-    Join all elements with separator
+    Join all elements with a separator
 
     :param content:
     :param sep:
@@ -168,7 +171,7 @@ def hlink(title, url):
     :param url:
     :return:
     """
-    return "<a href=\"{0}\">{1}</a>".format(url, quote_html(title))
+    return '<a href="{0}">{1}</a>'.format(url, quote_html(title))
 
 
 def escape_md(*content, sep=' '):
diff --git a/aiogram/utils/versions.py b/aiogram/utils/versions.py
index f1eb00c3..b621bc62 100644
--- a/aiogram/utils/versions.py
+++ b/aiogram/utils/versions.py
@@ -9,7 +9,8 @@ from .helper import Helper, HelperMode, Item
 
 
 class Version:
-    def __init__(self, major=0, minor=0, maintenance=0, stage='final', build=0):
+    def __init__(self, major=0, minor=0,
+                 maintenance=0, stage='final', build=0):
         self.__raw_version = None
         self.__version = None
 
@@ -86,7 +87,8 @@ class Version:
             if git_changeset:
                 sub = '.dev{0}'.format(git_changeset)
         elif version[3] != Stage.FINAL:
-            mapping = {Stage.ALPHA: 'a', Stage.BETA: 'b', Stage.RC: 'rc', Stage.DEV: 'dev'}
+            mapping = {Stage.ALPHA: 'a', Stage.BETA: 'b',
+                       Stage.RC: 'rc', Stage.DEV: 'dev'}
             sub = mapping[version[3]] + str(version[4])
 
         return str(main + sub)