diff --git a/README.md b/README.md
index 1cbc1f9..27a9c60 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
 # chinese-programmer-wrong-pronunciation
-中国程序员容易发音错误的单词 (以美式发音为准)
+中国程序员容易发音错误的单词 (以美式发音为准, 非音标为字母发音)
 
 
 1. hidden
 
-    ✅ ['hɪdn]
+    ✅ ['hɪdn]
 
     ❌ ['haidn]
  
@@ -19,3 +19,77 @@
    ✅ [kæʃ]
  
    ❌ [kætʃ]
+
+1. null
+
+   ✅ [nʌl]
+ 
+   ❌ [naʊ]
+
+1. jpg
+
+   ✅ [ˈdʒeɪpɛɡ]
+ 
+   ❌ jpg
+
+1. integer
+
+   ✅ [ˈɪntɪdʒə]
+ 
+   ❌ [ˈɪntaɪgə]
+
+1. GNU
+
+   ✅ [gnu:]
+ 
+   ❌ GNU
+
+1. GUI
+
+   ✅ [ˈɡui]
+ 
+   ❌ GUI
+
+1. nginx
+
+   ✅ Engine X
+ 
+   ❌ ngx
+
+1. Apache
+
+   ✅ [əˈpætʃiː]
+ 
+   ❌ [ʌpʌtʃ]
+
+1. avatar
+
+   ✅ [ˌævə'tɑr]
+ 
+   ❌ [ə'vʌtɑ]
+
+1. OS X
+
+   ✅ OS ten
+ 
+   ❌ OS X
+
+1. array
+
+    ✅ [ə'rei]
+ 
+    ❌ [æ'rei]
+
+1. retina
+
+    ✅ ['retnə]
+ 
+    ❌ [ritina]
+
+
+> 参考资料
+> 1. https://www.zhihu.com/question/19739907
+> 2. https://www.v2ex.com/t/131094
+> 3. https://www.v2ex.com/t/309350
+> 4. https://www.v2ex.com/t/63781
+> 5. https://www.v2ex.com/t/246033
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