diff --git a/content/Math4202/Math4202_L16.md b/content/Math4202/Math4202_L16.md
index e31d66f..114396e 100644
--- a/content/Math4202/Math4202_L16.md
+++ b/content/Math4202/Math4202_L16.md
@@ -61,4 +61,4 @@ Let $p: E\to B$ be a covering map, and $e_0\in E$ and $p(e_0)=b_0$. Let $F:I\tim
 
 Further more, if $F$ is a path homotopy, then $\tilde{F}$ is a path homotopy.
 
-Discuss on Firday.
+Discuss on Friday.