Documentation/git-update-index: refer to 'ls-files'

'ls-files' refers to 'update-index' to show how the 'assume unchanged'
bit can be seen. This makes the connection 'bi-directional'.

Signed-off-by: Stefan Naewe <stefan.naewe@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-update-index.txt

@@ -266,7 +266,9 @@ tree files, you have to explicitly tell git about it by dropping
 "assume unchanged" bit, either before or after you modify them.
 
 In order to set "assume unchanged" bit, use `--assume-unchanged`
-option.  To unset, use `--no-assume-unchanged`.
+option.  To unset, use `--no-assume-unchanged`. To see which files
+have the "assume unchanged" bit set, use `git ls-files -v`
+(see linkgit:git-ls-files[1]).
 
 The command looks at `core.ignorestat` configuration variable.  When
 this is true, paths updated with `git update-index paths...` and
@@ -365,7 +367,8 @@ ctime for marking files processed) (see linkgit:git-config[1]).
 SEE ALSO
 --------
 linkgit:git-config[1],
-linkgit:git-add[1]
+linkgit:git-add[1],
+linkgit:git-ls-files[1]
 
 
 Author