diff --git a/src/mongo/db/query/query_feature_flags.idl b/src/mongo/db/query/query_feature_flags.idl
index 2aeaff67d28..0bba55ae9dc 100644
--- a/src/mongo/db/query/query_feature_flags.idl
+++ b/src/mongo/db/query/query_feature_flags.idl
@@ -335,3 +335,10 @@ feature_flags:
         default: true
         version: 8.3
         fcv_gated: true
+
+    featureFlagVectorSearchExtension:
+        description: "Feature flag to enable vector search extension functionality."
+        cpp_varname: gFeatureFlagVectorSearchExtension
+        default: false
+        fcv_gated: false
+        incremental_rollout_phase: in_development