clarified -prg documentation

Author: mist64

README.md

@@ -97,7 +97,7 @@ You can start `x16emu`/`x16emu.exe` either by double-clicking it, or from the co
 * `-sdcard` lets you specify an SD card image (partition table + FAT32). Without this option, drive 8 will interface to the current directory on the host.
 * `-serial` makes accesses to the host filesystem go through the Serial Bus [experimental].
 * `-nohostieee` disables IEEE API interception to access the host fs.
-* `-prg` lets you specify a `.prg` file that gets injected into RAM after start.
+* `-prg` lets you specify a `.prg` file that gets loaded after start. It is fetched from the host filesystem, even if an SD card is attached!
 * `-bas` lets you specify a BASIC program in ASCII format that automatically typed in (and tokenized).
 * `-run` executes the application specified through `-prg` or `-bas` using `RUN` or `SYS`, depending on the load address.
 * `-geos` launches GEOS at startup.

src/main.c

@@ -387,8 +387,8 @@ usage()
 	printf("\tIEEE API host fs is normally enabled unless -sdcard or\n");
 	printf("\t-serial is specified.\n");
 	printf("-prg <app.prg>[,<load_addr>]\n");
-	printf("\tLoad application from the local disk into RAM\n");
-	printf("\t(.PRG file with 2 byte start address header)\n");
+	printf("\tLoad application from the *host filesystem* into RAM,\n");
+	printf("\teven if an SD card is attached.\n");
 	printf("\tThe override load address is hex without a prefix.\n");
 	printf("-bas <app.txt>\n");
 	printf("\tInject a BASIC program in ASCII encoding through the\n");