README.md in redis-session-store-0.5.0 vs README.md in redis-session-store-0.6.0

@@ -78,9 +78,44 @@
   # ... other options ...
   on_redis_down: ->(e, env, sid) { do_something_will_ya!(e) }
 }
 ```
 
+### Serializer
+
+By default the Marshal serializer is used. With Rails 4, you can use JSON as a
+custom serializer:
+
+* `:json` - serialize cookie values with `JSON` (Requires Rails 4+)
+* `:marshal` - serialize cookie values with `Marshal` (Default)
+* `:hybrid` - transparently migrate existing `Marshal` cookie values to `JSON` (Requires Rails 4+)
+* `CustomClass` - You can just pass the constant name of any class that responds to `.load` and `.dump`
+
+``` ruby
+My::Application.config.session_store = :redis_session_store, {
+  # ... other options ...
+  serializer: :hybrid
+}
+```
+
+**Note**: Rails 4 is required for using the `:json` and `:hybrid` serializers
+because the `Flash` object doesn't serializer well in 3.2. See [Rails #13945](https://github.com/rails/rails/pull/13945) for more info.
+
+### Session load error handling
+
+If you want to handle cases where the session data cannot be loaded, a
+custom callable handler may be provided as `on_session_load_error` which
+will be given the error and the session ID.
+
+``` ruby
+My::Application.config.session_store = :redis_session_store, {
+  # ... other options ...
+  on_session_load_error: ->(e, sid) { do_something_will_ya!(e) }
+}
+```
+
+**Note** The session will *always* be destroyed when it cannot be loaded.
+
 Contributing, Authors, & License
 --------------------------------
 
 See [CONTRIBUTING.md](CONTRIBUTING.md), [AUTHORS.md](AUTHORS.md), and
 [LICENSE](LICENSE), respectively.