diff --git a/.gitignore b/.gitignore
index a2f8372..fb710ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 # `.config/git/ignore`.
 # This .gitignore is for this repo only.
 .DS_Store
+.zshcustom
 .vscode/
 .config/tmux/plugins
 .config/git/gpg
diff --git a/.zshrc b/.zshrc
index f81a9c6..4ed81b6 100644
--- a/.zshrc
+++ b/.zshrc
@@ -14,3 +14,9 @@ source <(fzf --zsh)
 if [ "$TERM_PROGRAM" != "Apple_Terminal" ]; then
   eval "$(oh-my-posh init zsh --config $HOME/.config/ohmyposh/config.toml)"
 fi
+
+# Platform-specific configuration lives inside .zshcustom.
+# The file is ignored by the dotfiles git repo.
+if [ -f $HOME/.zshcustom ]; then
+    source $HOME/.zshcustom
+fi