Made the docs a bit more clear

README.md

@@ -18,13 +18,15 @@ tulflash example
 # Compile, flash and monitor the example program:
 tulflash run example.c:
 
-# note: `tulflash run example.c` is the thing as `tulflash write --cmd "sdcc example.c" --monitor example.ihx`
+# note: `tulflash run example.c` is the thing as `mkdir t"ulflash/" && tulflash write --cmd "sdcc example.c" --cmd-path "tulflash/" --monitor example.ihx`
 ```
 
 If the flash fails, try to add `--slow` before `run` (should not be needed though).
 
 ## Manually flashing Intel HEX binaries
 
+If you use an external toolchain (such as MCU8051IDE with SDCC) and only want to use this program just for flashing the generated HEX file, just run the following:
+
 ```bash
 # All OSes, automatically detects the correct serial port
 tulflash write <path-to-hex>