Fix integration filter documentation

README.md

@@ -11,6 +11,7 @@ For installation instructions [see this guide](https://github.com/thomasloven/ha
 ```yaml
 type: custom:auto-entities
 card: <card>
+card_param: <card_param>
 entities:
   - <entity>
   - <entity>
@@ -56,7 +57,7 @@ Filters have the following options, and will match any entity fulfilling **ALL**
 - `device:` Match entities belonging to given device (e.g. `Thomas iPhone`)
 - `device_manufacturer` Match entities belonging to a device by a given manufacturer (e.g. `IKEA`)
 - `device_model` Match entities belonging to a device of a given model (e.g. `Hue white ambiance E26/E27 (8718696548738)`)
-- `integration:` Match entities by integration identifier (e.g. `plex`, `input_boolean`, `xiaomi_miio`, `mobile_app`)
+- `integration:` Match entities by integration identifier (e.g. `plex`, `input_boolean`, `xiaomi_miio`, `mobile_app` - Many integrations cannot be matched due to Home Assistant limitations)
 - `attributes:` Map of `attribute: value` pairs to match.
 - `last_changed:` Match minutes since last state change (most useful as a comparison, e.g. `last_changed: < 15`)
 - `last_updated:` Match minutes since last update