diff --git a/tree.go b/tree.go
index 6335cb8..a574b4f 100644
--- a/tree.go
+++ b/tree.go
@@ -258,7 +258,7 @@ func fixFormat(dir string, attachmentRegistry map[string]string) error {
 				if err != nil {
 					aPath := path.Clean(fmt.Sprintf("%s/%s", path.Dir(fullPath), string(match[2][:])))
 					if _, ok := attachmentRegistry[aPath]; ok {
-						link := fmt.Sprintf("(%s)[%s]", match[1], attachmentRegistry[aPath])
+						link := fmt.Sprintf("![%s](%s)", match[1], attachmentRegistry[aPath])
 						data = bytes.Replace(data, match[0], []byte(link), 1)
 					}
 				}