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-rw-r--r--doc/metadata.mdwn7
1 files changed, 5 insertions, 2 deletions
diff --git a/doc/metadata.mdwn b/doc/metadata.mdwn
index df873c4c1..d51758038 100644
--- a/doc/metadata.mdwn
+++ b/doc/metadata.mdwn
@@ -23,12 +23,15 @@ The field names are limited to alphanumerics (and `[_-.]`), and are case
insensitive. The metadata values can contain absolutely anything you
like -- but you're recommended to keep it simple and reasonably short.
-Here are some recommended metadata fields to use:
+Here are some metadata fields that git-annex has special support for:
* `tag` - With each tag being a different value.
* `year`, `month` - When this particular version of the file came into
being.
-
+* `$field-lastchanged` - This is automatically maintained for each
+ field that's set, and gives the time stamp (since the Unix epoch)
+ of the most recent change to the field. It cannot be modified directly.
+
To make git-annex automatically set the year and month when adding files,
run `git config annex.genmetadata true`. Also, see
[[tips/automatically_adding_metadata]].