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+Plugins
+====================
+
+`Schema`s are pluggable, that is, they allow for applying pre-packaged
+capabilities to extend their functionality.
+
+Suppose that we have several collections in our database and want
+to add last-modified functionality to each one. With plugins this
+is easy. Just create a plugin once and apply it to each `Schema`:
+
+    // lastMod.js
+    module.exports = exports = function lastModifiedPlugin (schema, options) {
+      schema.add({ lastMod: Date })
+
+      schema.pre('save', function (next) {
+        this.lastMod = new Date
+        next()
+      })
+
+      if (options && options.index) {
+        schema.path('lastMod').index(options.index)
+      }
+    }
+
+    // in your schema files
+    var lastMod = require('./lastMod');
+
+    var Game = new Schema({ ... });
+
+    Game.plugin(lastMod);
+
+    var Player = new Schema({ ... });
+
+    Player.plugin(lastMod, { index: true });
+
+In the example above we added last-modified functionality to both the Game
+and Player schemas. We also took advantage of options passing supported by
+the `plugin()` method to dynamically define an index on the Player.