From da00466081feedb2e9e0cd771aa95d8bcb22c385 Mon Sep 17 00:00:00 2001
From: Frank Yu <withyuxiaoy@gmail.com>
Date: Sat, 3 Jul 2021 00:44:10 +0800
Subject: [PATCH] Update docs for theming

---
 doc/development/theming.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/development/theming.rst b/doc/development/theming.rst
index da2c644b9..a63a1d668 100644
--- a/doc/development/theming.rst
+++ b/doc/development/theming.rst
@@ -256,6 +256,9 @@ Here is some sample code to accomplish this:
 
 .. code-block:: python
 
+   from os import path
+   from sphinx.util.fileutil import copy_asset_file
+
    def copy_custom_files(app, exc):
        if app.builder.format == 'html' and not exc:
            staticdir = path.join(app.builder.outdir, '_static')