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-rw-r--r--Documentation/git.txt8
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diff --git a/Documentation/git.txt b/Documentation/git.txt
index afb48d39bb..96354af0d7 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -809,6 +809,14 @@ Git so take care if using Cogito etc.
an explicit repository directory set via 'GIT_DIR' or on the
command line.
+'GIT_COMMON_DIR'::
+ If this variable is set to a path, non-worktree files that are
+ normally in $GIT_DIR will be taken from this path
+ instead. Worktree-specific files such as HEAD or index are
+ taken from $GIT_DIR. See linkgit:gitrepository-layout[5] for
+ details. This variable has lower precedence than other path
+ variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
+
Git Commits
~~~~~~~~~~~
'GIT_AUTHOR_NAME'::