diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 71a083c4c..4819169cb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -71,7 +71,7 @@ To maximize the readability and correctness of our code, we require that new sub
 
 	```
 - Avoid using global variables and avoid '=='
-- use 'let' over 'var'
+- Please use 'let' over 'var'
 - Better to use ECMAScript 6
 - Avoid importing external libraries for basic algorithms. Only use those libraries for complicated algorithms.