For example '-1'.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 contrib/related/git-related | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/contrib/related/git-related b/contrib/related/git-related
index 2f38ee1..e8603be 100755
--- a/contrib/related/git-related
+++ b/contrib/related/git-related
@@ -23,7 +23,8 @@ begin
       $show_commits = v || true
     end
   end.parse!
-rescue OptionParser::InvalidOption
+rescue OptionParser::InvalidOption => e
+  $rev_args += e.args
 end
 
 class Commit
@@ -135,9 +136,11 @@ class Commits
 
     case revs.size
     when 1
-      committish = [ '%s..HEAD' % revs[0] ]
+      r = revs[0]
+      r = '^' + r if r[0] != '-'
+      args = [ r, 'HEAD' ]
     else
-      committish = revs
+      args = revs
     end
 
     source = nil
-- 
1.8.2.1

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