diff --git a/s3/s3.go b/s3/s3.go
index 40ada57cd835a1254b5cb98fd81a89f206ca257a..7bb8799ca72b60e1c912067e63430e2633c1b40f 100644
--- a/s3/s3.go
+++ b/s3/s3.go
@@ -48,6 +48,14 @@ const (
 
 	// MIMETypeDefault defines the constant for the default MIME type.
 	MIMETypeDefault MIMEType = "application/octet-stream"
+
+	// TypeXLS defines the constant for the XLS MIME type.
+	MIMETypeXLS     MIMEType = "application/vnd.ms-excel"
+
+	// TypeXLSX defines the constant for the XLSX MIME type.
+	MIMETypeXLSX MIMEType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+
+
 )
 
 type SessionWithHelpers struct {