diff --git a/README.md b/README.md
index b72b911..ede414b 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ Features
 * Texcoord
 * Normal
 * Material
-  * Unknown material attributes are treated as key-value(value is string).
+  * Unknown material attributes are returned as key-value(value is string) map.
 
 Notes
 -----