diff --git a/assets/latex.js b/assets/latex.js
index 1181000..0687930 100644
--- a/assets/latex.js
+++ b/assets/latex.js
@@ -99,6 +99,7 @@ document.addEventListener("DOMContentLoaded", function() {
         "\\cubed": "{^{3}}",
         "\\per": "/",
         "\\percent": "\\%",
+        "\\ppm": "\\text{ppm}",
         "\\tera": "\\text{T}",
         "\\giga": "\\text{G}",
         "\\mega": "\\text{M}",