diff --git a/hosts/README.md b/hosts/README.md
index e715c60e..89a71c11 100644
--- a/hosts/README.md
+++ b/hosts/README.md
@@ -1,6 +1,8 @@
 # Hosts
 
-1. `harmonica`: My MacBook Pro 2020 13-inch, for work.
+1. macOS
+   1. `fern`: MacBook Pro 2022 13-inch M2 16G, mainly for business.
+   1. `harmonica`: MacBook Pro 2020 13-inch i5 16G, for personal use.
 2. `idols`
    1. `ai`: My main computer, with NixOS + I5-13600KF + RTX 4090 GPU, for gaming & daily use.
    2. `aquamarine`: My NixOS virtual machine with R9-5900HX(8C16T), for distributed building & testing.
diff --git a/hosts/harmonica/default.nix b/hosts/harmonica/default.nix
index c16aa62d..5ff956d3 100644
--- a/hosts/harmonica/default.nix
+++ b/hosts/harmonica/default.nix
@@ -1,7 +1,7 @@
 {username, ...} @ args:
 #############################################################
 #
-#  Harmonica - my MacBook Pro 2020 13-inch, mainly for personal use
+#  Harmonica - MacBook Pro 2020 13-inch i5 16G, mainly for personal use
 #
 #############################################################
 let