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+
+How to replace services and aliases provided by other Bundles
+=============================================================
+
+.. versionadded:: 2.3
+   The ability to replace existing services and aliases
+   is new to version 2.3
+
+Sometimes you might want to replace service or alias that is provided by
+different Bundle; for example you might want to completely re-invent the
+wheel or just decorate implementation of particular feature.
+
+Lets assume that some bundle provides service with ID ``bundle.service``
+and we want to replace that service with our implementation:
+
+.. configuration-block::
+
+    .. code-block:: yaml
+
+        # yoursbundle/Resources/config/services.yml
+        service:
+            yoursbundle.my.service:
+                class: YoursBundle\YourClass
+                tags:
+                    - { name: framework.service_replacer, replaces: bundle.service }
+
+    .. code-block:: xml
+
+        <!-- yoursbundle/Resources/config/services.xml -->
+        <service id="yoursbundle.my.service"
+        class="YoursBundle\YourClass">
+            <tag name="framework.service_replacer" replaces="bundle.service" />
+        </service>
+
+    .. code-block:: php
+
+        $container->register('yoursbundle.my.service', 'YoursBundle\YourClass')
+            ->addTag('framework.service_replacer', array('replaces' => 'bundle.service'));
+
+Now when you'll request ``bundle.service`` from container, you'll get yours
+implementation (``yoursbundle.my.service``) instead.
+
+.. note::
+
+    If old service was tagged, the tags will be removed, you have to properly
+    tag yours definition to behave correctly, as replacement.
+
+Old service will be still accessible witch changed ID, by default changed
+ID will have ``.orig`` suffix, but you can change it for some completely
+different, by setting ``renameTo`` argument on tag.