Update README.md

Author: kamyu104

README.md

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 # [LeetCode](https://leetcode.com/problemset/algorithms/) ![Language](https://img.shields.io/badge/language-Python%20%2F%20C++%2011-orange.svg) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.md) [![SayThanks](https://img.shields.io/badge/say-thanks-ff69b4.svg)](https://saythanks.io/to/kamyu104) ![Travis](https://travis-ci.org/kamyu104/LeetCode-Solutions.svg?branch=master)
 
 The number of LeetCode questions is increasing every week. For more solutions of questions, you can see my [LintCode](https://github.com/kamyu104/LintCode) repository.
-I'll keep updating for full summary and better solutions. Stay tuned for updates.
+I'll keep updating for full summary and better solutions. Since some question descriptions may be accidentally taken down by some company request, only solutions will be updated. Stay tuned for updates.
 (Notes: "📖" means you need to subscribe to [LeetCode premium membership](https://leetcode.com/subscribe/) for the access to premium questions.)
 
 ## Algorithms