Update README.md

README.md

@@ -16,6 +16,7 @@ Run the app in terminal for usage instruction, but in case you're lazy:
     frltoggle 60 --save-previous              sets the FPS limit to 60 and saves the previous value to a file.
     frltoggle 60 --save-previous-or-reuse     sets the FPS limit to 60 and saves the previous value to a file.
                                               If the file already exists, its value will be validated and reused instead.
+                                              This is useful in case the system has crashed and we want to reuse the value from before the crash.
     frltoggle load-file                       loads the value from file (e.g., saved using "--save-previous") and uses it to set FRL.
                                               File is removed afterwards if no errors occur.
 ```