diff --git a/platformio.ini b/platformio.ini
index 8ce7f37..ee4a0c8 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -100,6 +100,9 @@ lib_deps =
 ; Perform PlatformIO: Clean after changing library version and
 ; in case of issues remove the old version from .pio/libdeps/*.
 
+; If LMIC_DEBUG_LEVEL is set to value > 0 then LMIC_PRINTF_TO will 
+; be automatically set to serial (do not set it explicitly).  
+
 lib_deps =
     ; Only ONE of below LMIC libraries should be enabled.
     mcci-catena/MCCI LoRaWAN LMIC library           ; MCCI LMIC library (latest release)
@@ -108,21 +111,21 @@ lib_deps =
 build_flags =
     ; Use platformio.ini for settings instead lmic_project_config.h.
     -D ARDUINO_LMIC_PROJECT_CONFIG_H_SUPPRESS
-    ;
+
     ; Ping and beacons not supported for class A, disable to save memory.
     -D DISABLE_PING
     -D DISABLE_BEACONS
-    ;    
+
     ; If LMIC_DEBUG_LEVEL is set to value > 0 then LMIC_PRINTF_TO will 
     ; be automatically set to serial (do not set it explicitly).
     ; -D LMIC_DEBUG_LEVEL=1            ; 0, 1 or 2
-    ;
+    
     ; -D CFG_sx1272_radio=1            ; Use for SX1272 radio
     -D CFG_sx1276_radio=1              ; Use for SX1276 radio
     -D USE_ORIGINAL_AES                ; Faster but larger, see docs
     ; -D LMIC_USE_INTERRUPTS           ; Not tested or supported on many platforms
     ; -D LMIC_ENABLE_DeviceTimeReq=1   ; Network time support
-    ;
+
     ; --- Regional settings -----
     ; Enable only one of the following regions:    
     ; -D CFG_as923=1
@@ -143,14 +146,18 @@ build_flags =
 
 [classic_lmic]    
 ; IMPORTANT:
+; This library was recently deprecated and is no longer maintained.
+; It is not fully LoRaWAN compliant (e.g. in handling of MAC commands)
+; and is therefore less suitable for use with The Things Network V3.
+;
 ; Region, radio and debug settings CANNOT be changed in platformio.ini.
 ; They must be configured in file: config.h in the following location:
 ; .pio/libdeps/<board-id>/IBM LMIC framework/src/lmic
-; 
+;
 ; When making changes to config.h: 
 ; CONFIG.H MUST BE CHANGED FOR EACH BOARD SEPARATELY!
 ; (By default libraries are installed per project per build config/board.)
-;
+
 ; If LMIC_DEBUG_LEVEL is set to value > 0 then LMIC_PRINTF_TO will 
 ; be automatically set to serial (do not set it explicitly).  
 
@@ -161,8 +168,8 @@ build_flags =
     ; DEFAULT VALUES defined in config.h:
     ; CFG_sx1276_radio 1
     ; CFG_eu868 1
-    ; LMIC_DEBUG_LEVEL 0   
-    ;
+    ; LMIC_DEBUG_LEVEL 0 
+
     ; Ping and beacons not supported for class A, disable to save memory.
     -D DISABLE_PING
     -D DISABLE_BEACONS
@@ -352,7 +359,7 @@ lib_deps =
 build_flags =
     ${common.build_flags}
     ${classic_lmic.build_flags}
-    ; ${mcci_lmic.lib_deps}  ; MCCI LMIC better LoRaWAN compliance but uses more memory 
+    ; ${mcci_lmic.build_flags}  ; MCCI LMIC better LoRaWAN compliance but uses more memory 
     -D BSFILE=\"boards/lora32u4II.h\"
     -D MONITOR_SPEED=${common.monitor_speed}
     -D USE_SERIAL
@@ -687,7 +694,7 @@ lib_deps =
 build_flags =
     ${common.build_flags}
     ${classic_lmic.build_flags}
-    ; ${mcci_lmic.lib_deps}  ; MCCI LMIC better LoRaWAN compliance but uses more memory
+    ; ${mcci_lmic.build_flags}  ; MCCI LMIC better LoRaWAN compliance but uses more memory
     -D BSFILE=\"boards/pro8mhzatmega328.h\"
     -D MONITOR_SPEED=${common.monitor_speed}
     -D USE_SERIAL