diff --git a/models/io.go b/models/io.go
index 38b6199..51884d3 100644
--- a/models/io.go
+++ b/models/io.go
@@ -30,7 +30,7 @@ type Query struct {
 	Name string `json:"name"`
 }
 
-// NewDeviceToCow to add device object id to cow
+// NewDeviceToCow is to add device object id to cow
 type NewDeviceToCow struct {
 	ID string `json:"_id"`
 }