diff --git a/README.md b/README.md
index 9b145a0..d52fa99 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ $$
 
 $$
 \begin{align*}
-\vec{a} \times \vec{b} =
+\vec{A} \times \vec{B} =
 \begin{vmatrix}
 i & j & k\\
 a_1 & a_2 & a_3\\