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+The migrate_plus module extends the core migration system with API enhancements
+and additional functionality, as well as providing practical examples.
+
+Extensions to base API
+======================
+* A Migration configuration entity is provided, enabling persistance of dynamic
+  migration configuration.
+* A ConfigEntityDiscovery class is implemented which enables plugin
+  configuration to be based on configuration entities. This is fully general -
+  it can be used for any configuration entity type, not just migrations.
+* A MigrationConfigEntityPluginManager class and corresponding
+  plugin.manager.config_entity_migration service is provided, to enable
+  discovery and instantiation of migration plugins based on the Migration
+  configuration entity.
+* A MigrationGroup configuration entity is provided, which enables migrations to
+  be organized in groups, and to maintain shared configuration in one place.
+* A MigrateEvents::PREPARE_ROW event is provided to dispatch hook_prepare_row()
+  invocations as events.
+* A SourcePluginExtension class is provided, enabling one to define fields and
+  IDs for a source plugin via configuration rather than requiring PHP code.
+
+Plugin types
+============
+migrate_plus provides the following plugin types, for use with the url source
+plugin.
+
+* A data_parser type, for parsing different formats on behalf of the url source
+  plugin.
+* A data_fetcher type, for fetching data to feed into a data_parser plugin.
+* An authentication type, for adding authentication headers with the http
+  data_fetcher plugin.
+
+Plugins
+=======
+
+Process
+-------
+* The entity_lookup process plugin allows you to populate references to entities
+  which already exist in Drupal, whether they were migrated or not.
+* The entity_generate process plugin extends entity_lookup to also create the
+  desired entity when it doesn't already exist.
+* The file_blob process plugin supports creating file entities from blob data.
+* The merge process plugin allows the merging of multiple arrays into a single
+  field.
+* The skip_on_value process plugin allows you to skip a row, or a given field,
+  for specific source values.
+
+Source
+------
+* A url source plugin is provided, implementing a common structure for
+  file-based data providers.
+
+Data parsers
+------------
+* The xml parser plugin uses PHP's XMLReader interface to incrementally parse
+  XML files. This should be used for XML sources which are potentially very
+  large.
+* The simple_xml parser plugin uses PHP's SimpleXML interface to fully parse
+  XML files. This should be used for XML sources where you need to be able to
+  use complex xpaths for your item selectors, or have to access elements outside
+  of the current item element via xpaths.
+* The json parser plugin supports JSON sources.
+* The soap parser plugin supports SOAP sources.
+
+Data fetchers
+-------------
+* The file fetcher plugin works for most URLs regardless of protocol, as well as
+  local filesystems.
+* The http fetcher plugin provides the ability to add headers to an HTTP
+  request (particularly through authentication plugins).
+
+Authentication
+--------------
+* The basic authentication plugin provides HTTP Basic authentication.
+* The digest authentication plugin provides HTTP Digest authentication.
+* The oauth2 authencitation plugin provides OAuth2 authentication over HTTP.
+
+Examples
+========
+* The migrate_example submodule provides a fully functional and runnable
+example migration scenario demonstrating the basic concepts and most common
+techniques for SQL-based migrations.
+* The migrate_example_advanced submodule provides examples of migration from
+different kinds of sources, as well as less common techniques.