diff --git a/README.rst b/README.rst
index 747072e..f473a3c 100644
--- a/README.rst
+++ b/README.rst
@@ -353,6 +353,10 @@ Compatibility
 -------------
 
 * This plugin is *not* compatible with pytest-xdist's --looponfail flag.
+* This plugin is *not* compatible with
+  `pytest-forked <https://pypi.org/project/pytest-forked/>`_: both plugins
+  override ``pytest_runtest_protocol``, and whichever runs first prevents
+  the other from working, so tests are not re-run.
 * This plugin is *not* compatible with the core --pdb flag.
 * This plugin is *not* compatible with the plugin
   `flaky <https://pypi.org/project/flaky/>`_, you can only have
diff --git a/changes/313.doc.rst b/changes/313.doc.rst
new file mode 100644
index 0000000..3f0d0ab
--- /dev/null
+++ b/changes/313.doc.rst
@@ -0,0 +1,3 @@
+Document the incompatibility with ``pytest-forked``: both plugins override
+``pytest_runtest_protocol`` and whichever runs first prevents the other
+from working.