diff --git a/doc/git-annex.mdwn b/doc/git-annex.mdwn
index 97f2b29185..f3bbe05021 100644
--- a/doc/git-annex.mdwn
+++ b/doc/git-annex.mdwn
@@ -1136,7 +1136,8 @@ file contents are present at either of two repositories.
 * `--metadata field=glob`
 
   Matches only files that have a metadata field attached with a value that
-  matches the glob.
+  matches the glob. The values of metadata fields are matched case
+  insensitively.
 
 * `--want-get`