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-rw-r--r--Help/prop_test/RESOURCE_LOCK.rst8
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diff --git a/Help/prop_test/RESOURCE_LOCK.rst b/Help/prop_test/RESOURCE_LOCK.rst
index 755e0aaa3..8b13a01d4 100644
--- a/Help/prop_test/RESOURCE_LOCK.rst
+++ b/Help/prop_test/RESOURCE_LOCK.rst
@@ -8,3 +8,11 @@ not to run concurrently.
See also :prop_test:`FIXTURES_REQUIRED` if the resource requires any setup or
cleanup steps.
+
+Both the :prop_test:`RESOURCE_GROUPS` and ``RESOURCE_LOCK`` properties serve
+similar purposes, but they are distinct and orthogonal. Resources specified by
+:prop_test:`RESOURCE_GROUPS` do not affect ``RESOURCE_LOCK``, and vice versa.
+Whereas ``RESOURCE_LOCK`` is a simpler property that is used for locking one
+global resource, :prop_test:`RESOURCE_GROUPS` is a more advanced property
+that allows multiple tests to simultaneously use multiple resources of the
+same type, specifying their requirements in a fine-grained manner.