blame-options.txt: document --first-parent option

juped · gitster · commit 11bc12ae1ecf · 2020-08-06T14:08:10.000-07:00
blame/annotate have supported --first-parent since commit 95a4fb0 ("blame: handle --first-parent"). This adds a blurb on that option to the documentation. Signed-off-by: Raymond E. Pasco <ray@ameretat.dev> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/blame-options.txt b/Documentation/blame-options.txt
@@ -36,6 +36,12 @@ include::line-range-format.txt[]
 	START.  `git blame --reverse START` is taken as `git blame
 	--reverse START..HEAD` for convenience.
 
+--first-parent::
+	Follow only the first parent commit upon seeing a merge
+	commit. This option can be used to determine when a line
+	was introduced to a particular integration branch, rather
+	than when it was introduced to the history overall.
+
 -p::
 --porcelain::
 	Show in a format designed for machine consumption.
