diff --git a/sections/en-us/README.md b/sections/en-us/README.md
index ef9d9ae..35526ba 100644
--- a/sections/en-us/README.md
+++ b/sections/en-us/README.md
@@ -169,6 +169,9 @@
 
 **Common Problem**
 
+* How does HTTP pass `let arr = [1,2,3,4]` to the server by GET method? [[more]](/sections/en-us/util.md#get-param)
+* How to implement util.inherits in Node.js? [[more]](/sections/en-us/util.md#utilinherits)
+* How do I get all the file names under a folder? [[more]](/sections/en-us/util.md#q-traversal)
 
 [View more](/sections/en-us/util.md)
 
diff --git a/sections/en-us/util.md b/sections/en-us/util.md
index 5bb71f5..b7a376f 100644
--- a/sections/en-us/util.md
+++ b/sections/en-us/util.md
@@ -128,7 +128,7 @@ Most of them can be used as an interview to ask how to implement.
 
 ### util.inherits
 
-> how to implement util.inherits in Node.js?
+> How to implement util.inherits in Node.js?
 
 https://github.com/nodejs/node/blob/v7.6.0/lib/util.js#L960