Merge branch 'maint'

[git.git] / Documentation / git-update-index.txt

diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index a91fd214d2246b6fbf20543a8d285f619ecd7e58..6b930bc16303e6a17554a551badfe01febaf3ca1 100644 (file)
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -88,6 +88,16 @@ OPTIONS
        sometimes helpful when working with a big project on a
        filesystem that has very slow lstat(2) system call
        (e.g. cifs).
++
+This option can be also used as a coarse file-level mechanism
+to ignore uncommitted changes in tracked files (akin to what
+`.gitignore` does for untracked files).
+You should remember that an explicit 'git add' operation will
+still cause the file to be refreshed from the working tree.
+Git will fail (gracefully) in case it needs to modify this file
+in the index e.g. when merging in a commit;
+thus, in case the assumed-untracked file is changed upstream,
+you will need to handle the situation manually.
 
 -g::
 --again::