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+## filter mod
+
+This mod adds a simple chat filter. There is no default word list,
+and adding words to the filter list is done through the `/filter`
+chat command. You need the `server` priv to use the chat command.
+
+The `/filter` chat command can `add`, `remove` or `list` words. The
+words are stored in `mod_storage`, which means that this mod requires
+0.4.16 or above to function.
+
+If a player speaks a word that is listed in the filter list, they are
+muted for 1 minute. After that, their `shout` privilege is restored.
+If they leave, their `shout` privilege is still restored, but only after
+the time expires, not before.
+
+## Bugs
+
+- the `shout` priv is permanently lost if the server shuts down while
+a player is muted.
+