diff --git a/structs.go b/structs.go
index 99a6e0c..ed9c691 100644
--- a/structs.go
+++ b/structs.go
@@ -84,8 +84,10 @@ type Response struct {
 	Aggregations map[string]Aggregation `json:"aggregations,omitempty"`
 }
 
+// Represents an aggregation from response
 type Aggregation map[string]interface{}
 
+// Represents a bucket for aggregation
 type Bucket map[string]interface{}
 
 // Represents a document to send to elasticsearch