mention --skip-reason in backporting docs.
diff --git a/docs/index.txt b/docs/index.txt
index 3a321ed..f407867 100644
--- a/docs/index.txt
+++ b/docs/index.txt
@@ -183,7 +183,7 @@
to get the patch committed.
If it turns out that there's nothing that should be applied from the failed commit,
- run ``python backport.py --skip-current``.
+ run ``python backport.py --skip-current``, maybe with ``--skip-reason``.
If you have to make changes, please do a ``git commit --amend`` and add notes
about what needed doing below the ``Signed-off-by`` block.