diff --git a/proto/environments/environments_v1.proto b/proto/environments/environments_v1.proto
index 1f7a3f5..1a1f658 100644
--- a/proto/environments/environments_v1.proto
+++ b/proto/environments/environments_v1.proto
@@ -83,6 +83,7 @@ message EnvironmentSpec {
   Kubernetes kubernetes = 2;
   ServerType server_type = 3;
   Location server_location = 4;
+  int32 disk_size = 5;
 }
 
 message EnvironmentFull {