diff --git a/src/pytest_html/nextgen.py b/src/pytest_html/nextgen.py
index 4a4a7e35..e471fd1a 100644
--- a/src/pytest_html/nextgen.py
+++ b/src/pytest_html/nextgen.py
@@ -203,8 +203,7 @@ def pytest_runtest_logreport(self, report):
 
         test_index = hasattr(report, "rerun") and report.rerun + 1 or 0
 
-        # TODO rename to "extras" since list
-        report_extras = getattr(report, "extra", [])
+        report_extras = getattr(report, "extras", [])
         for extra_index, extra in enumerate(report_extras):
             content = extra["content"]
             asset_name = self._asset_filename(test_id, extra_index, test_index, extra['extension'])
diff --git a/src/pytest_html/plugin.py b/src/pytest_html/plugin.py
index 7fbd3cac..103be5d5 100644
--- a/src/pytest_html/plugin.py
+++ b/src/pytest_html/plugin.py
@@ -2,6 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 import pytest
+import warnings
 from pathlib import Path
 
 from . import extras  # noqa: F401
@@ -114,8 +115,8 @@ def pytest_runtest_makereport(item, call):
     report = outcome.get_result()
     if report.when == "call":
         fixture_extras = getattr(item.config, "extras", [])
-        plugin_extras = getattr(report, "extra", [])
-        report.extra = fixture_extras + plugin_extras
+        plugin_extras = getattr(report, "extras", [])
+        report.extras = fixture_extras + plugin_extras
 
 
 @pytest.fixture
@@ -130,6 +131,27 @@ def extra(pytestconfig):
         def test_foo(extra):
             extra.append(pytest_html.extras.url("https://www.example.com/"))
     """
+    warnings.warn(
+        "The 'extra' fixture is deprecated and will be removed in a future release, use 'extras' instead.",
+        DeprecationWarning
+    )
+    pytestconfig.extras = []
+    yield pytestconfig.extras
+    del pytestconfig.extras[:]
+
+
+@pytest.fixture
+def extras(pytestconfig):
+    """Add details to the HTML reports.
+
+    .. code-block:: python
+
+        import pytest_html
+
+
+        def test_foo(extras):
+            extras.append(pytest_html.extras.url("https://www.example.com/"))
+    """
     pytestconfig.extras = []
     yield pytestconfig.extras
     del pytestconfig.extras[:]