[PATCH] Document option --only of git commit

[Johannes Sixt <johannes.sixt@telecom.at>]

Its documentation was removed by 6c96753df9db7f790a2ac4d95ec2a868394cd5ff,
even though it is referenced from a few places, including builtin-commit.c
(as part of the commentary in the commit message template).

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
---
 Documentation/git-commit.txt |   11 +++++++++++
 builtin-commit.c             |    2 +-
 2 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index b4ae61f..4bb51cc 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt
@@ -139,6 +139,17 @@ but can be used to amend a merge commit.
 	as well.  This is usually not what you want unless you
 	are concluding a conflicted merge.
 
+-o|--only::
+	Make a commit only from the paths specified on the
+	command line, disregarding any contents that have been
+	staged so far. This is the default mode of operation of
+	'git commit' if any paths are given on the command line,
+	in which case this option can be omitted.
+	If this option is specified together with '--amend', then
+	no paths need be specified, which can be used to amend
+	the last commit without committing changes that have
+	already been staged.
+
 -u|--untracked-files::
 	Show all untracked files, also those in uninteresting
 	directories, in the "Untracked files:" section of commit
diff --git a/builtin-commit.c b/builtin-commit.c
index e3adfdf..bcb7aaa 100644
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -98,7 +98,7 @@ static struct option builtin_commit_options[] = {
 	OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
 	OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
 	OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
-	OPT_BOOLEAN('o', "only", &only, ""),
+	OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
 	OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
 	OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
 	OPT_BOOLEAN(0, "untracked-files", &untracked_files, "show all untracked files"),
-- 
1.5.5.33.g376d1