diff --git a/client/client.go b/client/client.go
index c9cc4cd..575c285 100644
--- a/client/client.go
+++ b/client/client.go
@@ -53,6 +53,7 @@ type Message struct { // TODO combine with server.message
 	Raw            string
 }
 
+// Attachment represents a message attachment
 type Attachment struct {
 	Name    string `json:"name"`
 	Type    string `json:"type,omitempty"`