diff --git a/default.nix b/default.nix
index f7110891..f189eb29 100644
--- a/default.nix
+++ b/default.nix
@@ -19,5 +19,9 @@ pkgs.mkShell {
       cargo-make
       typos
       go_1_20
+
+      # To get sha256 around pkgs.fetchFromGitHub in CLI
+      nix-prefetch-git
+      jq
     ];
 }
diff --git a/home-manager/home.nix b/home-manager/home.nix
index 1226ed15..4ec37a54 100644
--- a/home-manager/home.nix
+++ b/home-manager/home.nix
@@ -2,8 +2,8 @@
 
 # FAQ
 #
-# A. How to get sha256?
-# Q. Assume by `lib.fakeSha256` at first, you can get the hash with an error message
+# A. How to get sha256 without `lib.fakeSha256`?
+# Q. `nix-prefetch-git --url https://github.com/oh-my-fish/plugin-foreign-env.git --rev 3ee95536106c11073d6ff466c1681cde31001383 --quiet | jq .hash`
 
 {
   imports = [