M configs.go → configs.go

@@ -349,6 +349,7 @@
 // DocumentConfig contains information about a SendDocument request.
 type DocumentConfig struct {
 	BaseFile
+	Caption string
 }
 
 // values returns a url.Values representation of DocumentConfig.
@@ -359,6 +360,9 @@ return v, err
 	}
 
 	v.Add(config.name(), config.FileID)
+	if config.Caption != "" {
+		v.Add("caption", config.Caption)
+	}
 
 	return v, nil
 }
@@ -366,6 +370,10 @@
 // params returns a map[string]string representation of DocumentConfig.
 func (config DocumentConfig) params() (map[string]string, error) {
 	params, _ := config.BaseFile.params()
+
+	if config.Caption != "" {
+		params["caption"] = config.Caption
+	}
 
 	return params, nil
 }