Emacs: Comment on broken C-M-a in diff-mode that must be reported

.emacs.d/init.el

@@ -101,6 +101,8 @@
 ;;; Diff
 ;;; REVIEW: Show permissions in ztree.
 ;;; See https://github.com/fourier/ztree/issues/50.
+;;; TODO: In diff-mode, both `[[` and `C-M-a` do not go back to previous index
+;;; once they are at the beginning of an index.
 (nconc package-selected-packages '(ztree))
 (when (require 'evil-diff nil t)
   (add-hook 'diff-mode-hook 'evil-diff-init))