diff --git a/src/content/blog/math/svd-pca.md b/src/content/blog/math/svd-pca.md
index eab20f5..6beceae 100644
--- a/src/content/blog/math/svd-pca.md
+++ b/src/content/blog/math/svd-pca.md
@@ -73,7 +73,7 @@ $$
 w_{(1)} = \arg \max \left\{ \frac{w^TX^TXw}{w^Tw} \right\}
 $$
 
-**瑞利商（Rayleigh quotient）**的定义是：
+**瑞利商（Rayleigh quotient）** 的定义是：
 
 $$
 R(M, x) = \frac{x^*Mx} {x^*x}