diff --git a/README.md b/README.md
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@@ -0,0 +1,11 @@
+<!-- Author : ddswhu & Liam Huang-->
+<!-- Program Email: elegantlatex2e@gmail.com -->
+
+# Introduction
+
+ElegantNote is designed for Books. Just enjoy it! If you have any questions, suggestions or bug reports, you can visit [ElegantBook/issues](https://github.com/ElegantLaTeX/ElegantBook/issues). Looking for other templates designed by ElegantLaTeX Group? Please visit: [https://github.com/ElegantLaTeX](https://github.com/ElegantLaTeX).
+
+
+如果你有其他问题、建议或者报告 bug，可以在 [ElegantBook/issues](https://github.com/ElegantLaTeX/ElegantBook/issues) 留言。如果你想了解更多由 ElegantLaTeX 项目组设计的模板，请访问 [https://github.com/ElegantLaTeX](https://github.com/ElegantLaTeX)。
+
+This work is released under the LaTeX Project Public License, v1.3c or later. 
diff --git a/elegantbook.pdf b/elegantbook.pdf
index 9a4a729..365b450 100644
Binary files a/elegantbook.pdf and b/elegantbook.pdf differ
diff --git a/elegantbook.tex b/elegantbook.tex
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--- a/elegantbook.tex
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@@ -144,7 +144,7 @@ Lebesgue 积分有几种不同的定义方式。我们将采用逐步定义非
 设 $ f(x)=\sum\limits_{i=1}^{k} a_i \chi_{A_i}(x)$ 是 $E$ 上的非负简单函数，其中 $\{A_1,A_2,\ldots,A_k\}$ 是 $E$ 上的一个可测分割，$a_1,a_2,\ldots,a_k$ 是非负实数。定义 $f$ 在 $E$ 上的积分为
 \begin{equation}
    \label{inter}
-   \int_{E} f dx = \sum_{i=1}^k a_i m(A_i).
+   \int_{E} f dx = \sum_{i=1}^k a_i m(A_i). 
 \end{equation}
 一般情况下 $0 \leq \int_{E} f dx \leq \infty$。若 $\int_{E} f dx < \infty$，则称 $f$ 在 $E$ 上可积。
 \end{definition}