ref-filter: add support for %(upstream:track,nobracket)

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 3f4d1edb1f4f034fbe47356993deacbcadb1ccca..976243a63e6ee4c4627a8a0db77bab2846d17f40 100644 (file)
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -516,7 +516,9 @@ the command pipe on exit. The filter is expected to detect EOF
 and exit gracefully on its own. Git will wait until the filter
 process has stopped.
 
-If you develop your own long running filter
+A long running filter demo implementation can be found in
+`contrib/long-running-filter/example.pl` located in the Git
+core repository. If you develop your own long running filter
 process then the `GIT_TRACE_PACKET` environment variables can be
 very helpful for debugging (see linkgit:git[1]).