Update README.md

README.md

@@ -65,6 +65,8 @@ The NVS parameter "metadata_config" sets how metadata is displayed for AirPlay a
 
 - 'format' can contain free text and any of the 3 keywords %artist%, %album%, %title%. Using that format string, the keywords are replaced by their value to build the string to be displayed. Note that the plain text following a keyword that happens to be empty during playback of a track will be removed. For example, if you have set format=%artist% - %title% and there is no artist in the metadata then only <title> will be displayed not " - <title>".
 
+Currently only 128x32 I2C display like [this](https://www.buydisplay.com/i2c-blue-0-91-inch-oled-display-module-128x32-arduino-raspberry-pi) are supported
+
 ### Set GPIO
 The parameter "set_GPIO" is use to set assign GPIO to various functions.