From c3bccdd5611cf77e35e545a331d9a9459418bc39 Mon Sep 17 00:00:00 2001
From: Dianshii <74195924+Dianshii@users.noreply.github.com>
Date: Sat, 25 Mar 2023 03:00:04 +0100
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---
 src/ch12-05-working-with-environment-variables.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/ch12-05-working-with-environment-variables.md b/src/ch12-05-working-with-environment-variables.md
index f855952..22e4500 100644
--- a/src/ch12-05-working-with-environment-variables.md
+++ b/src/ch12-05-working-with-environment-variables.md
@@ -98,6 +98,12 @@ $ IGNORE_CASE=1 cargo run to poem.txt
 PS> $Env:IGNORE_CASE=1; cargo run to poem.txt
 ```
 
+而这会让 `IGNORE_CASE` 的效果在当前 shell 会话中持续生效。可以通过 `Remove-Item` 命令来取消设置：
+
+```console
+PS> Remove-Item Env:IGNORE_CASE
+```
+
 这回应该得到包含可能有大写字母的 “to” 的行：
 
 ```console