diff --git a/temporalio/client/_workflow.py b/temporalio/client/_workflow.py
index 0607ade0a..8bbb67f69 100644
--- a/temporalio/client/_workflow.py
+++ b/temporalio/client/_workflow.py
@@ -1255,10 +1255,18 @@ class WorkflowExecution:
     """Run ID for the parent workflow if this was started as a child."""
 
     root_id: str | None
-    """ID for the root workflow."""
+    """ID for the root workflow.
+
+    The root namespace is not retained and may differ from this workflow's namespace for
+    cross-namespace child workflows. Track it separately if needed.
+    """
 
     root_run_id: str | None
-    """Run ID for the root workflow."""
+    """Run ID for the root workflow.
+
+    The root namespace is not retained and may differ from this workflow's namespace for
+    cross-namespace child workflows. Track it separately if needed.
+    """
 
     raw_info: temporalio.api.workflow.v1.WorkflowExecutionInfo
     """Underlying protobuf info."""
diff --git a/temporalio/workflow/_context.py b/temporalio/workflow/_context.py
index b33f83150..c9daaf670 100644
--- a/temporalio/workflow/_context.py
+++ b/temporalio/workflow/_context.py
@@ -92,6 +92,8 @@ class Info:
     namespace: str
     parent: ParentInfo | None
     root: RootInfo | None
+    """Root information. Its namespace is not retained and may differ from this workflow's
+    namespace for cross-namespace child workflows. Track it separately if needed."""
     priority: temporalio.common.Priority
     """The priority of this workflow execution. If not set, or this server predates priorities,
     then returns a default instance."""
@@ -217,7 +219,11 @@ class ParentInfo:
 
 @dataclass(frozen=True)
 class RootInfo:
-    """Information about the root workflow."""
+    """Information about the root workflow.
+
+    The namespace is not retained and may differ from the current workflow's namespace for
+    cross-namespace child workflows. Track it separately if needed.
+    """
 
     run_id: str
     workflow_id: str