doc: add some crossrefs between manual pages

diff --git a/Documentation/gitrepository-layout.txt b/Documentation/gitrepository-layout.txt
index 17d2ea6c1e48733d85a8caa49f6143c76edb09aa..79653f313474fa658f072c97d8744e5afccb77d7 100644 (file)
--- a/Documentation/gitrepository-layout.txt
+++ b/Documentation/gitrepository-layout.txt
@@ -155,6 +155,10 @@ index::
        The current index file for the repository.  It is
        usually not found in a bare repository.
 
+sharedindex.<SHA-1>::
+       The shared index part, to be referenced by $GIT_DIR/index and
+       other temporary index files. Only valid in split index mode.
+
 info::
        Additional information about the repository is recorded
        in this directory.