diff --git a/scripts/darwin_set_proxy.py b/scripts/darwin_set_proxy.py
index 437b08b8..cc3c0c2d 100644
--- a/scripts/darwin_set_proxy.py
+++ b/scripts/darwin_set_proxy.py
@@ -1,5 +1,7 @@
 """
-  set proxy for nix-daemon to speed up downloads
+  Set proxy for nix-daemon to speed up downloads
+  You can safely ignore this file if you don't need a proxy.
+                                                                                                                                                                                                                                                                                          
   https://github.com/NixOS/nix/issues/1472#issuecomment-1532955973
 """
 import os
@@ -7,31 +9,33 @@ import plistlib
 import shlex
 import subprocess
 from pathlib import Path
-
-
+                                                                                                                                                                                                                                                                                          
+                                                                                                                                                                                                                                                                                          
 NIX_DAEMON_PLIST = Path("/Library/LaunchDaemons/org.nixos.nix-daemon.plist")
 NIX_DAEMON_NAME = "org.nixos.nix-daemon"
-# http proxy provided by clash
-HTTP_PROXY = "http://127.0.0.1:7890"       
-
+# http proxy provided by clash or other proxy tools
+HTTP_PROXY = "http://127.0.0.1:7890"
+                                                                                                                                                                                                                                                                                          
 pl = plistlib.loads(NIX_DAEMON_PLIST.read_bytes())
-
-# set http proxy
-pl["EnvironmentVariables"]["HTTP_PROXY"] = HTTP_PROXY
-pl["EnvironmentVariables"]["HTTPS_PROXY"] = HTTP_PROXY
-
+                                                                                                                                                                                                                                                                                          
+# set http/https proxy
+# NOTE: curl only accept the lowercase of `http_proxy`!
+# NOTE: https://curl.se/libcurl/c/libcurl-env.html
+pl["EnvironmentVariables"]["http_proxy"] = HTTP_PROXY
+pl["EnvironmentVariables"]["https_proxy"] = HTTP_PROXY
+                                                                                                                                                                                                                                                                                          
 # remove http proxy
-# pl["EnvironmentVariables"].pop("HTTP_PROXY", None)
-# pl["EnvironmentVariables"].pop("HTTPS_PROXY", None)
-
+# pl["EnvironmentVariables"].pop("http_proxy", None)
+# pl["EnvironmentVariables"].pop("https_proxy", None)
+                                                                                                                                                                                                                                                                                          
 os.chmod(NIX_DAEMON_PLIST, 0o644)
 NIX_DAEMON_PLIST.write_bytes(plistlib.dumps(pl))
 os.chmod(NIX_DAEMON_PLIST, 0o444)
-
+                                                                                                                                                                                                                                                                                          
 # reload the plist
 for cmd in (
-	f"launchctl unload {NIX_DAEMON_PLIST}",
-	f"launchctl load {NIX_DAEMON_PLIST}",
+        f"launchctl unload {NIX_DAEMON_PLIST}",
+        f"launchctl load {NIX_DAEMON_PLIST}",
 ):
     print(cmd)
     subprocess.run(shlex.split(cmd), capture_output=False)