[PATCH v2 3/6] doc: clarify ignore rules for git ls-files

[Andreas Heiduk <asheiduk@gmail.com>]

Explain that `git ls-files --ignored` requires at least one
of the `--exclude*` options to do its job.

Signed-off-by: Andreas Heiduk <asheiduk@gmail.com>
---
 Documentation/git-ls-files.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-ls-files.txt b/Documentation/git-ls-files.txt
index 3ac3e3a77d..f3474b2ede 100644
--- a/Documentation/git-ls-files.txt
+++ b/Documentation/git-ls-files.txt
@@ -53,7 +53,8 @@ OPTIONS
 	Show only ignored files in the output. When showing files in the
 	index, print only those matched by an exclude pattern. When
 	showing "other" files, show only those matched by an exclude
-	pattern.
+	pattern. Standard ignore rules are not automatically activated,
+	therefore at least one of the `--exclude*` options is required.
 
 -s::
 --stage::
-- 
2.16.2