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diff --git a/doc/wiki/Quota.Dirsize.txt b/doc/wiki/Quota.Dirsize.txt
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+Dirsize quota
+=============
+
+The /dirsize/ quota backend supports *storage* quota limits, but not *messages*
+quota limits. The current quota is calculated by finding all files in
+configured mail directories and summing up their sizes. This works pretty fast
+with mboxes, but *dirsize is a really bad idea with maildirs*. It will end up
+eating all your CPU and disk I/O.
+
+Example
+-------
+
+---%<-------------------------------------------------------------------------
+plugin {
+  # 10MB quota limit
+  quota = dirsize:User quota
+  quota_rule = *:storage=10M
+}
+---%<-------------------------------------------------------------------------
+
+(This file was created from the wiki on 2019-06-19 12:42)