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diff --git a/doc/git-annex.mdwn b/doc/git-annex.mdwn
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--- a/doc/git-annex.mdwn
+++ b/doc/git-annex.mdwn
@@ -162,10 +162,15 @@ Many git-annex commands will stage changes for later `git commit` by you.
* migrate [path ...]
Changes the specified annexed files to store their content in the
- default backend (or the one specified with --backend).
+ default backend (or the one specified with --backend). Only files whose
+ content is currently available are migrated.
Note that the content is not removed from the backend it was previously in.
- Use `git annex unused` to find and remove such content.
+ Use `git annex unused` to find and remove such content.
+
+ Normally, nothing will be done to files already in the backend.
+ However, if a backend changes the information it uses to construct a key,
+ this can also be used to migrate files to use the new key format.
* map