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Update README.md

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@ -117,10 +117,14 @@ Pi-KVM supports several different hardware configurations, referred to as **plat
* HDMI capture device: see v2 description.
* ATX control (optional): see v2 description.
## A few words about HDMI-USB dongle
It's completely supported Pi-KVM works great with it. However, we recommend to use [HDMI-CSI bridge](https://aliexpress.ru/item/4000102166176.html) because the USB dongle has several major disadvantages compared to it: USB gives a lot of latency (200ms vs 100ms) and it doesn't support stream compression control (you won't be able to use Pi-KVM in a place with a poor internet connection). It also cannot automatically detect screen resolution. All this is caused by the hardware limitations of the dongle itself. In addition, some users report hardware problems: the dongle may not work in the BIOS or simply stop working after a while. It's a black box, and no one knows what's inside it. If you have problems with it, it will not be possible to fix them.
### A few words about HDMI-USB dongle
It's completely supported and Pi-KVM works great with it. However, we recommend to use [HDMI-CSI bridge](https://aliexpress.ru/item/4000102166176.html) because the USB dongle has several major disadvantages compared to it: USB gives a lot of latency (200ms vs 100ms) and it doesn't support stream compression control (you won't be able to use Pi-KVM in a place with a poor internet connection).
## Addition
It also cannot automatically detect screen resolution. All this is caused by the hardware limitations of the dongle itself.
In addition, some users report hardware problems: the dongle may not work in the BIOS or simply stop working after a while. It's a black box, and no one knows what's inside it. If you have problems with it, it will not be possible to fix them.
### Addition
* If you want to capture VGA from your server instead of HDMI, buy the [VGA-to-HDMI converter](https://aliexpress.ru/item/4000553298530.html).
* Pi-KVM can be powered using PoE, but it is not recommend to use the official PoE HAT: it is unreliable and [not compatible with the HDMI bridge](https://github.com/pikvm/pikvm/issues/6). Use any other PoE hat without an I2C fan controller.
* **Don't use random relay modules or random optocouplers!** Some relays or optocouplers may not be sensitive enough for the Raspberry Pi, some others may be low-level controlled. Either use relays that are activated by a high logic level, or follow the design provided and buy an OMRON. See details [here](https://github.com/pikvm/pikvm/issues/13).