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-rw-r--r--lisp/diff-mode.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/diff-mode.el b/lisp/diff-mode.el
index 0208660c1a9..34b116d92c8 100644
--- a/lisp/diff-mode.el
+++ b/lisp/diff-mode.el
@@ -92,7 +92,8 @@ when editing big diffs)."
(defcustom diff-auto-refine t
"Automatically highlight changes in detail as the user visits hunks."
- :type 'boolean)
+ :type 'boolean
+ :group 'diff-mode)
(defcustom diff-mode-hook nil
"Run after setting up the `diff-mode' major mode."