diff --git a/scripts/download-katex-assets.sh b/scripts/download-katex-assets.sh
index 68ee1bcb..9c555b6b 100755
--- a/scripts/download-katex-assets.sh
+++ b/scripts/download-katex-assets.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
-
+#
+# Download the KaTeX fonts and CSS, and copy them into `static`.
 set -e
 
 root=$(git rev-parse --show-toplevel)