blame-options.txt: explain that -L <start> and <end> are optional

The ability to omit either end of the -L range is a handy but
undocumented shortcut, and is thus not easily discovered. Fix this
shortcoming.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/blame-options.txt b/Documentation/blame-options.txt
index 624b3532a236709d5692e523be084534e367c90c..4e55b1564e8ad6526c53f797141cfccd83648fc7 100644 (file)
--- a/Documentation/blame-options.txt
+++ b/Documentation/blame-options.txt
@@ -11,8 +11,11 @@
 
 -L <start>,<end>::
 -L :<regex>::
-       Annotate only the given line range.  <start> and <end> can take
-       one of these forms:
+       Annotate only the given line range.  <start> and <end> are optional.
+       ``-L <start>'' or ``-L <start>,'' spans from <start> to end of file.
+       ``-L ,<end>'' spans from start of file to <end>.
++
+<start> and <end> can take one of these forms:
 
 include::line-range-format.txt[]