git hunk 編集モード - '-' 行を削除する方法は？

質問

+ bbb
- aaa

# ---
# To remove '-' lines, make them ' ' lines (context).
# To remove '+' lines, delete them.
# Lines starting with # will be removed.
#
# If the patch applies cleanly, the edited hunk will immediately be
# marked for staging. If it does not apply cleanly, you will be given
# an opportunity to edit again. If all lines of the hunk are removed,
# then the edit is aborted and the hunk is left unchanged.

私は単に make them ' ' lines の意味がわかりません。どのように適用すれば + bbb だけでなく - aaa ?

どのように解決するのですか？

make them ' ' lines というのは - を、行の前にある (スペース)で囲みます。