diff --git a/api-ref/source/parameters.yaml b/api-ref/source/parameters.yaml
index cfef117f8..fc9f15df0 100644
--- a/api-ref/source/parameters.yaml
+++ b/api-ref/source/parameters.yaml
@@ -197,7 +197,7 @@ allocation_candidates_same_subtree:
     A comma-separated list of request group suffix strings ($S). Each must
     exactly match a suffix on a granular group somewhere else in the request.
     Importantly, the identified request groups need not have a resources[$S].
-    If this is provided, at least one of the resource providers satisfying the
+    If this is provided, at least one of the resource providers satisfying a
     specified request group must be an ancestor of the rest.
     The ``same_subtree`` query parameter can be repeated and each repeat group
     is treated independently.
diff --git a/placement/rest_api_version_history.rst b/placement/rest_api_version_history.rst
index 0e35fca10..c5e9af97e 100644
--- a/placement/rest_api_version_history.rst
+++ b/placement/rest_api_version_history.rst
@@ -662,6 +662,6 @@ Add support for the ``same_subtree`` query parameter to the ``GET
 group suffix strings $S. Each must exactly match a suffix on a granular group
 somewhere else in the request. Importantly, the identified request groups need
 not have a resources$S. If this is provided, at least one of the resource
-providers satisfying the specified request group must be an ancestor of the
+providers satisfying a specified request group must be an ancestor of the
 rest. The ``same_subtree`` query parameter can be repeated and each repeat
 group is treated independently.
diff --git a/releasenotes/notes/allocation-candidate-same_subtree-aeed7b2570293dfb.yaml b/releasenotes/notes/allocation-candidate-same_subtree-aeed7b2570293dfb.yaml
index c1f0f0ae8..273ac69a8 100644
--- a/releasenotes/notes/allocation-candidate-same_subtree-aeed7b2570293dfb.yaml
+++ b/releasenotes/notes/allocation-candidate-same_subtree-aeed7b2570293dfb.yaml
@@ -6,6 +6,6 @@ features:
     list of request group suffix strings ($S). Each must exactly match a suffix
     on a granular group somewhere else in the request. Importantly, the
     identified request groups need not have a resources$S. If this is provided,
-    at least one of the resource providers satisfying the specified request
+    at least one of the resource providers satisfying a specified request
     group must be an ancestor of the rest. The ``same_subtree`` query parameter
     can be repeated and each repeated group is treated independently.