diff --git a/content/Math4201/Math4201_L2.md b/content/Math4201/Math4201_L2.md
index d3508ea..3f9c771 100644
--- a/content/Math4201/Math4201_L2.md
+++ b/content/Math4201/Math4201_L2.md
@@ -16,7 +16,7 @@ A topological space is a pair of set $X$ and a collection of subsets of $X$, den
 2. $\mathcal{T}$ is closed with respect to arbitrary unions. This means, for any collection of open sets $\{U_\alpha\}_{\alpha \in I}$, we have $\bigcup_{\alpha \in I} U_\alpha \in \mathcal{T}$
 3. $\mathcal{T}$ is closed with respect to finite intersections. This means, for any finite collection of open sets $\{U_1, U_2, \ldots, U_n\}$, we have $\bigcap_{i=1}^n U_i \in \mathcal{T}$
 
-The elements of $\mathcal{T}$ are called open sets.
+The elements of $\mathcal{T}$ are called **open sets**.
 
 The topological space is denoted by $(X, \mathcal{T})$.