diff --git a/platformio.ini b/platformio.ini
index 0a745d9a9..70de8b6ea 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -171,6 +171,7 @@ board_upload.flash_size = 4MB
 board_build.partitions = esp32_partition_4M.csv
 board_build.extra_flags = '-DEMSESP_DEFAULT_BOARD_PROFILE="S2MINI"'
 
+; https://github.com/platformio/platform-espressif32/blob/master/boards/lolin_s3.json
 [env:s3_16M_P]
 extends = espressi32_base
 board = lolin_s3