📝 Refer to 'PROGMEM' as 'flash'

Marlin/Configuration_adv.h

   //#define XYZ_NO_FRAME
   #define XYZ_HOLLOW_FRAME
 
-  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
+  // A bigger font is available for edit items. Costs 3120 bytes of flash.
   // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // A smaller font may be used on the Info Screen. Costs 2434 bytes of PROGMEM.
+  // A smaller font may be used on the Info Screen. Costs 2434 bytes of flash.
   // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
 
   //#define STATUS_ALT_FAN_BITMAP     // Use the alternative fan bitmap
   //#define STATUS_FAN_FRAMES 3       // :[0,1,2,3,4] Number of fan animation frames
   //#define STATUS_HEAT_PERCENT       // Show heating in a progress bar
-  //#define BOOT_MARLIN_LOGO_ANIMATED // Animated Marlin logo. Costs ~3260 (or ~940) bytes of PROGMEM.
+  //#define BOOT_MARLIN_LOGO_ANIMATED // Animated Marlin logo. Costs ~3260 (or ~940) bytes of flash.
 
   // Frivolous Game Options
   //#define MARLIN_BRICKOUT
 #define BUFSIZE 4
 
 // Transmission to Host Buffer Size
-// To save 386 bytes of PROGMEM (and TX_BUFFER_SIZE+3 bytes of RAM) set to 0.
+// To save 386 bytes of flash (and TX_BUFFER_SIZE+3 bytes of RAM) set to 0.
 // To buffer a simple "ok" you need 4 bytes.
 // For ADVANCED_OK (M105) you need 32 bytes.
 // For debug-echo: 128 bytes for the optimal speed.