update-index: do not die too early in a read-only repository.

diff --git a/Documentation/fetch-options.txt b/Documentation/fetch-options.txt
index 13f34d3ca28a402d56420f3bf5615837cf529e0a..5b4d184a73d013b8da11db3adb08905c0101bf88 100644 (file)
--- a/Documentation/fetch-options.txt
+++ b/Documentation/fetch-options.txt
@@ -36,6 +36,13 @@
 -u, \--update-head-ok::
        By default `git-fetch` refuses to update the head which
        corresponds to the current branch.  This flag disables the
-       check.  Note that fetching into the current branch will not
-       update the index and working directory, so use it with care.
+       check.  This is purely for the internal use for `git-pull`
+       to communicate with `git-fetch`, and unless you are
+       implementing your own Porcelain you are not supposed to
+       use it.
+
+\--depth=<depth>::
+       Deepen the history of a 'shallow' repository created by
+       `git clone` with `--depth=<depth>` option (see gitlink:git-clone[1])
+       by the specified number of commits.