diff --git a/.travis.yml b/.travis.yml
index 8c6342ccc..ba2ba37f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -105,7 +105,7 @@ after_success:
       coverage combine
       coverage xml --ignore-errors
       coverage report -m --ignore-errors
-      bash <(curl -s https://codecov.io/bash) -Z -X gcov -X coveragepy -X search -X xcode -X gcovout -X fix -f coverage.xml -F "${TOXENV//-/,},linux"
+      bash <(curl -s https://codecov.io/bash) -Z -X gcov -X coveragepy -X search -X xcode -X gcovout -X fix -f coverage.xml -F $TRAVIS_OS_NAME
     fi
 
 notifications:
diff --git a/doc/en/customize.rst b/doc/en/customize.rst
index 310b5c7b3..2329ec2d1 100644
--- a/doc/en/customize.rst
+++ b/doc/en/customize.rst
@@ -133,8 +133,8 @@ progress output, you can write it into a configuration file:
 
 .. code-block:: ini
 
-    # content of pytest.ini
-    # (or tox.ini or setup.cfg)
+    # content of pytest.ini or tox.ini
+    # setup.cfg files should use [tool:pytest] section instead
     [pytest]
     addopts = -ra -q
 
diff --git a/doc/en/goodpractices.rst b/doc/en/goodpractices.rst
index ba79e71f4..f08bd5c40 100644
--- a/doc/en/goodpractices.rst
+++ b/doc/en/goodpractices.rst
@@ -42,8 +42,8 @@ Conventions for Python test discovery
 * In those directories, search for ``test_*.py`` or ``*_test.py`` files, imported by their `test package name`_.
 * From those files, collect test items:
 
-  * ``test_`` prefixed test functions or methods outside of class
-  * ``test_`` prefixed test functions or methods inside ``Test`` prefixed test classes (without an ``__init__`` method)
+  * ``test`` prefixed test functions or methods outside of class
+  * ``test`` prefixed test functions or methods inside ``Test`` prefixed test classes (without an ``__init__`` method)
 
 For examples of how to customize your test discovery :doc:`example/pythoncollection`.
 
diff --git a/doc/en/mark.rst b/doc/en/mark.rst
index d5c5c5735..e841a6780 100644
--- a/doc/en/mark.rst
+++ b/doc/en/mark.rst
@@ -29,9 +29,11 @@ which also serve as documentation.
 Raising errors on unknown marks: --strict
 -----------------------------------------
 
-When the ``--strict`` command-line flag is passed, any marks not registered in the ``pytest.ini`` file will trigger an error.
+When the ``--strict`` command-line flag is passed, any unknown marks applied
+with the ``@pytest.mark.name_of_the_mark`` decorator will trigger an error.
+Marks defined or added by pytest or by a plugin will not trigger an error.
 
-Marks can be registered like this:
+Marks can be registered in ``pytest.ini`` like this:
 
 .. code-block:: ini
 
diff --git a/doc/en/reference.rst b/doc/en/reference.rst
index 24d5f7975..1ed5d91b1 100644
--- a/doc/en/reference.rst
+++ b/doc/en/reference.rst
@@ -1226,8 +1226,11 @@ passed multiple times. The expected format is ``name=value``. For example::
 
 .. confval:: markers
 
-    List of markers that are allowed in test functions, enforced when ``--strict`` command-line argument is used.
-    You can use a marker name per line, indented from the option name.
+    When the ``--strict`` command-line argument is used, only known markers -
+    defined in code by core pytest or some plugin - are allowed.
+    You can list additional markers in this setting to add them to the whitelist.
+
+    You can list one marker name per line, indented from the option name.
 
     .. code-block:: ini
 
diff --git a/scripts/upload-coverage.bat b/scripts/upload-coverage.bat
index 8a8d94c98..7391f817c 100644
--- a/scripts/upload-coverage.bat
+++ b/scripts/upload-coverage.bat
@@ -5,7 +5,7 @@ if not defined PYTEST_NO_COVERAGE (
     C:\Python36\Scripts\coverage combine
     C:\Python36\Scripts\coverage xml --ignore-errors
     C:\Python36\Scripts\coverage report -m --ignore-errors
-    scripts\appveyor-retry C:\Python36\Scripts\codecov --required -X gcov pycov search -f coverage.xml --flags %TOXENV:-= % windows
+    scripts\appveyor-retry C:\Python36\Scripts\codecov --required -X gcov pycov search -f coverage.xml --flags windows
 ) else (
     echo Skipping coverage upload, PYTEST_NO_COVERAGE is set
 )
diff --git a/tox.ini b/tox.ini
index 59879ead3..87a56f842 100644
--- a/tox.ini
+++ b/tox.ini
@@ -83,6 +83,7 @@ commands =
 deps =
     {[testenv]deps}
     twisted
+    unittest2
 commands =
     {env:_PYTEST_TOX_COVERAGE_RUN:} pytest {posargs:testing/test_unittest.py}