"the option is optional" was confusing as it is not the option but its
argument which is optional.

Signed-off-by: Nicolas Vigier <bo...@mars-attacks.org>
---
 Documentation/git-rev-parse.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 2b126c0..7ec9221 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -259,9 +259,10 @@ Each line of options has this format:
 
 `<flags>`::
        `<flags>` are of `*`, `=`, `?` or `!`.
-       * Use `=` if the option takes an argument.
+       * Use `=` if the option requires an argument.
 
-       * Use `?` to mean that the option is optional (though its use is 
discouraged).
+       * Use `?` if the option takes an optional argument (though its use is
+         discouraged).
 
        * Use `*` to mean that this option should not be listed in the usage
          generated for the `-h` argument. It's shown for `--help-all` as
-- 
1.8.4

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