Update README

Author: andfoy

README.rst

@@ -152,10 +152,9 @@ Or under the section `tool.pytest.ini_options` if using `pyproject.toml`:
     ]
 
 Similarly, if a function is known to be thread unsafe and should
-cause a test to be marked as thread-unsafe as well, the fully-qualified names
-of thread-unsafe functions can be registered through the
-`thread_unsafe_functions` option in the INI file (or under
-`tool.pytest.ini_options` when using `pyproject.toml`):
+cause a test to be marked as thread-unsafe as well, its fully-qualified name
+can be registered through the `thread_unsafe_functions` option in the
+INI file (or under `tool.pytest.ini_options` when using `pyproject.toml`):
 
 .. code-block:: ini
 
@@ -165,7 +164,7 @@ of thread-unsafe functions can be registered through the
         module.submodule2.func2
         ...
 
-Also, if you define a `__thread_unsafe__` attribute on a function that is
+Also, if you define a `__thread_safe__ = False` attribute on a function that is
 called by a test and is up to two levels below in the call stack, then
 pytest-run-parallel will automatically detect that a thread-unsafe function
 is being used and will mark the test as thread-unsafe.