diff --git a/src/main/proto/elastic_service.proto b/src/main/proto/elastic_service.proto
index f3f9129..5ae82e6 100644
--- a/src/main/proto/elastic_service.proto
+++ b/src/main/proto/elastic_service.proto
@@ -47,6 +47,7 @@ message CityNameRequest {
 message CoordsRequest {
   float lat = 1;
   float lon = 2;
+  optional string radius = 3;
 }
 
 service CitySearch {