diff --git a/src/mongo/s/sharding_feature_flags.idl b/src/mongo/s/sharding_feature_flags.idl
index 255f7b14d93..32febeeff23 100644
--- a/src/mongo/s/sharding_feature_flags.idl
+++ b/src/mongo/s/sharding_feature_flags.idl
@@ -197,3 +197,9 @@ feature_flags:
     default: true
     version: 8.1
     shouldBeFCVGated: true
+  # TODO (SERVER-94367): remove once 9.0 becomes last LTS.
+  featureFlagAggregateClusterCatalogAggStage:
+    description: "Feature flag for enabling the aggregation stage $aggregateClusterCatalog"
+    cpp_varname: feature_flags::gAggregateClusterCatalogAggStage
+    default: false
+    shouldBeFCVGated: true