[ale] Reversed (or previously applied) patch detected! Assume -R? [n]

[hxsrmeng]

Hi friends,

I am applying an unofficial patch to my kernel. But it gave me a message
that
"
Reversed (or previously applied) patch detected!  Assume -R? [n]
"
      * What does this mean? Should I continue with Yes or the default
        no?

Thanks.