diff --git a/custom.tex b/custom.tex
new file mode 100644
index 0000000000000000000000000000000000000000..15d50999a6dea282c086603cda925277a311154a
--- /dev/null
+++ b/custom.tex
@@ -0,0 +1,4 @@
+\lstdefinestyle{LaTeX}{
+  language=TeX,
+  morekeywords={begin, label, mathrm, frac}
+}