diff --git a/git-auto-commit-mode.el b/git-auto-commit-mode.el
index 08411a0..7652c99 100644
--- a/git-auto-commit-mode.el
+++ b/git-auto-commit-mode.el
@@ -51,6 +51,13 @@ If non-nil a git push will be executed after each commit."
   :group 'git-auto-commit-mode
   :type 'boolean)
 
+(defcustom gac-shell-and " && "
+  "How to join commands together in the shell. For fish shell,
+  you want to customise this to: \" ; and \" instead of the default."
+  :tag "Join shell commands"
+  :group 'git-auto-commit-mode
+  :type 'string)
+
 (defun gac-relative-file-name (filename)
   "Find the path to FILENAME relative to the git directory."
   (let* ((git-dir
@@ -111,7 +118,8 @@ Default to FILENAME."
          (default-directory (file-name-directory buffer-file)))
     (shell-command
      (concat "git add " (shell-quote-argument filename)
-             " && git commit -m " (shell-quote-argument commit-msg)))))
+             gac-shell-and
+             "git commit -m " (shell-quote-argument commit-msg)))))
 
 (defun gac-push ()
   "Push commits to the current upstream.