diff --git a/_posts/2015-10-20-math.md b/_posts/2015-10-20-math.md
index 9417b8118178..1fdca4dd216e 100644
--- a/_posts/2015-10-20-math.md
+++ b/_posts/2015-10-20-math.md
@@ -18,7 +18,7 @@ You can also use `\begin{equation}...\end{equation}` instead of `$$` for display
 MathJax will automatically number equations:
 
 \begin{equation}
-\label{eq:caushy-shwarz}
+\label{eq:cauchy-schwarz}
 \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)
 \end{equation}