diff --git a/README.md b/README.md
index 4e0e7eb..b5b9dcf 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,15 @@
 
     ❌ [sæfərɪ]
 
+1. sudo
+
+    ✅ [su:'du:]
+
+1. margin
+
+    ✅ ['mɑrdʒən]
+
+    ❌ ['mʌgin]
 
 > 参考资料
 >