diff --git a/CHANGES.rst b/CHANGES.rst
index 5ff3e891..486eb6ad 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -21,7 +21,7 @@ Unreleased
     :attr:`~.RetrievedFeed.caching_info`).
   * The ``HTTPAcceptParserType`` was renamed to :class:`.AcceptParserType`.
 
-* Allow :ref:`using the system-installed feedparser <use-system-feedparser>`
+* Allow :ref:`using the installed feedparser <no-vendored-feedparser>`
   instead of the one vendored by *reader*.
   This is useful for working around issues in the vendored feedparser,
   like the libxml2 <=2.13.3 incompatibility reported in :issue:`350`;
diff --git a/docs/install.rst b/docs/install.rst
index 49bcec3c..fc14f2b1 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -27,7 +27,7 @@ These packages will be installed automatically when installing *reader*:
 (at least SQLite 3.18 with the `JSON1`_ and `FTS5`_ extensions).
 
 
-.. _use-system-feedparser:
+.. _no-vendored-feedparser:
 
 .. note::
 
@@ -35,8 +35,8 @@ These packages will be installed automatically when installing *reader*:
   *reader* uses a vendored version of feedparser's `develop`_ branch
   by default since :ref:`version 2.9`.
   To opt out of this behavior, and make *reader* use
-  the system-installed ``feedparser`` package,
-  set the ``READER_USE_SYSTEM_FEEDPARSER`` environment variable to ``1``.
+  the installed ``feedparser`` package,
+  set the ``READER_NO_VENDORED_FEEDPARSER`` environment variable to ``1``.
 
 .. _develop: https://github.com/kurtmckee/feedparser
 
diff --git a/src/reader/_parser/feedparser.py b/src/reader/_parser/feedparser.py
index 7ea5f383..1e5fb34f 100644
--- a/src/reader/_parser/feedparser.py
+++ b/src/reader/_parser/feedparser.py
@@ -20,7 +20,7 @@
 from ._http_utils import unparse_accept_header
 
 
-if os.environ.get('READER_USE_SYSTEM_FEEDPARSER', '') not in ('', '0'):
+if os.environ.get('READER_NO_VENDORED_FEEDPARSER', '') not in ('', '0'):
     import feedparser  # type: ignore
 else:
     from .._vendor import feedparser
diff --git a/tests/test_parser.py b/tests/test_parser.py
index 072807bc..c0d30036 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -1172,7 +1172,7 @@ def test_reader_use_system_feedparser(monkeypatch, reload_module):
     import reader._parser.feedparser
     import reader._vendor.feedparser
 
-    name = 'READER_USE_SYSTEM_FEEDPARSER'
+    name = 'READER_NO_VENDORED_FEEDPARSER'
 
     monkeypatch.delenv(name, raising=False)
     reload_module(reader._parser.feedparser)