setup.c: support multi-checkout repo setup

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 922072596fdd80eaaa47746fba5e5591223c5108..e1623ec6d13b64e80263943d0ca037b8b20e7b4e 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -393,6 +393,8 @@ false), while all other repositories are assumed to be bare (bare
 
 core.worktree::
        Set the path to the root of the working tree.
+       If GIT_COMMON_DIR environment variable is set, core.worktree
+       is ignored and not used for determining the root of working tree.
        This can be overridden by the GIT_WORK_TREE environment
        variable and the '--work-tree' command-line option.
        The value can be an absolute path or relative to the path to