diff --git a/topics/01_cameras/index.md b/topics/01_cameras/index.md
index 7a10efc7ac3cf7d4c3d2e507c60dce6e9b02ada8..14ead8c381a4552a31b0f6adc4b6db5b9447df69 100644
--- a/topics/01_cameras/index.md
+++ b/topics/01_cameras/index.md
@@ -228,7 +228,7 @@ There are plenty of lens distortion models, with varying complexity and number o
 
 $$
 \begin{cases}
-u_u = u_{cd} + (u - u_{cd})\alpha
+u_u = u_{cd} + (u - u_{cd})\alpha\\
 v_u = v_{cd} + (v - v_{cd})\alpha
 \end{cases}
 $$