diff --git a/static/js/libs/katex.js b/static/js/libs/katex.js
index 9eb5541..9964bba 100644
--- a/static/js/libs/katex.js
+++ b/static/js/libs/katex.js
@@ -10,6 +10,7 @@ window.addEventListener("load", () => {
       la: "leftarrow",
       RA: "Rightarrow",
       LA: "Leftarrow",
+      u: "mu",
     })
   )[Symbol.iterator]()) {
     macros[`\\${item[0]}`] = `\\${item[1]}`;