added comment

Author: munzili

platformio.ini

@@ -25,7 +25,7 @@ extra_scripts =
 lib_deps =
 	PubSubClient@^2.8
 	ESPAsyncWebServer-esphome@^3.3.0
-	ArduinoJson@^6.21.0
+	ArduinoJson@^6.21.0 ; Keep Version 6.21, creates lower Firmware footprint on Jan 2025 than Version 7.3
 	asjdf/WebSerialLite@^2.3.0
 	107-Arduino-MCP2515@^1.5.0
 build_flags =