ediff-nix-help-in-control-buffer, to match doc and usage.
(defvar ediff-use-last-dir nil
"*If t, Ediff uses previous directory as default when reading file name.")
-(defvar ediff-nix-help-in-control-buffer nil
- "*Non-nil mean C-h should not to invoke Emacs help.
+(defvar ediff-no-help-in-control-buffer nil
+ "*Non-nil mean C-h should not invoke Emacs help.
Instead, C-h jumps to previous difference.")
(defvar ediff-temp-file-prefix