[PATCH v5 2/2] git-contacts: add stdin functionality to docs

[Brigham Campbell <me@brighamcampbell.com>]

git-contacts now accepts patches via stdin. Optionally, multiple patches
may be concatenated before piping the result into git-contacts.
Document this feature.

Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
---
 contrib/contacts/git-contacts.adoc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contrib/contacts/git-contacts.adoc b/contrib/contacts/git-contacts.adoc
index dd914d1261..4e0b518aae 100644
--- a/contrib/contacts/git-contacts.adoc
+++ b/contrib/contacts/git-contacts.adoc
@@ -24,7 +24,8 @@ Input consists of one or more patch files or revision arguments.  A revision
 argument can be a range or a single `<rev>` which is interpreted as
 `<rev>..HEAD`, thus the same revision arguments are accepted as for
 linkgit:git-format-patch[1]. Patch files and revision arguments can be combined
-in the same invocation.
+in the same invocation.  A single dash `'-'` character in place of a `<patch>`
+tells the command to read patch file(s) from the standard input.
 
 This command can be useful for determining the list of people with whom to
 discuss proposed changes, or for finding the list of recipients to Cc: when

-- 
2.55.0