diff --git a/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.pdf b/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.pdf
index 36f6ead..dc16732 100644
Binary files a/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.pdf and b/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.pdf differ
diff --git a/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.tex b/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.tex
index 807f01d..b35dd70 100644
--- a/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.tex
+++ b/advanced-math/knowledge/3-applications-of-derivatives/applications-of-derivatives.tex
@@ -127,6 +127,8 @@ $\text{罗尔定理}\xrightleftharpoons[\text{特例：}f(a)=f(b)]{\text{泛化
 
 \section{洛必达法则}
 
+\subsection{定理}
+
 若当$x\to a$或$x\to\infty$时两个函数$f(x)F(x)$都趋向0或无穷大，那么极限$\lim\limits_{x\to \frac{a}{\infty}}\dfrac{f(x)}{F(x)}$可能存在，也可能不存在，这种极限就是不定式。\medskip
 
 \textcolor{aqua}{\textbf{定理：}}
@@ -138,7 +140,7 @@ $\text{罗尔定理}\xrightleftharpoons[\text{特例：}f(a)=f(b)]{\text{泛化
     \item $\lim\limits_{x\to a}\dfrac{f(x)}{g(x)}=\lim\limits_{x\to a}\dfrac{f'(x)}{g'(x)}$或$\lim\limits_{x\to\infty}\dfrac{f(x)}{g(x)}=\lim\limits_{x\to\infty}\dfrac{f'(x)}{g'(x)}$。
 \end{enumerate}
 
-\textcolor{orange}{注意：}
+\subsection{注意事项}
 
 \begin{enumerate}
     \item 如果函数比值不为$\dfrac{0}{0}$或$\dfrac{\infty}{\infty}$型，则不能使用洛必达法则。