diff --git a/dot_config/fish/config.fish b/dot_config/fish/config.fish
index f0fd699..3b229d0 100644
--- a/dot_config/fish/config.fish
+++ b/dot_config/fish/config.fish
@@ -27,12 +27,15 @@ if status is-interactive
     type -q zoxide; and zoxide init --cmd=cd fish | source
 
     # ========= 编辑器/查看器（优先 vim，否则 vi）=========
+    # SUDO_EDITOR：供 visudo / sudoedit 等使用；若仍打开 nano，需在 sudoers 中加 Defaults env_keep += "SUDO_EDITOR"
     if type -q vim
         set -gx EDITOR vim
         set -gx VISUAL vim
+        set -gx SUDO_EDITOR vim
     else if type -q vi
         set -gx EDITOR vi
         set -gx VISUAL vi
+        set -gx SUDO_EDITOR vi
     end
 
     # ========= fastfetch：启动信息显示 =========