diff --git a/protobufs/rpc/io.proto b/protobufs/rpc/io.proto
index 9c7dadff..3a890b50 100644
--- a/protobufs/rpc/io.proto
+++ b/protobufs/rpc/io.proto
@@ -166,10 +166,15 @@ message EvaluateSIPDispatchRulesResponse {
   // Keys are the names of X-* headers and values are the names of attributes they will be mapped to.
   map<string, string> headers_to_attributes = 14;
 
-  repeated string enabled_features = 15;
+  repeated SIPFeature enabled_features = 15;
   // NEXT ID: 16
 }
 
+enum SIPFeature {
+  NONE = 0;
+  KRISP_ENABLED = 1;
+}
+
 enum SIPDispatchResult {
   LEGACY_ACCEPT_OR_PIN = 0; // check request_pin field
   ACCEPT = 1;