update README.md 9

README.md

@@ -16,7 +16,7 @@ NOTE: use option `copy` if you are not sure how to restore your payload files, w
 
 ## Three ways to install a module
 * with cpan `cpan Archive::BagIt`
-* with cpanm `cpanm Archive::BagIt` (Note: `cpan App::cpanminus` must be installed)
+* with cpanm `cpanm Archive::BagIt` (Note: `cpan App::cpanminus` must be installed). To force installation run `cpanm -i -f Archive::BagIt`.
 * manual as downloaded package
   1. Download for example Archive-BagIt-0.065.tar.gz from [metacpan Archive::BagIt](https://metacpan.org/pod/Archive::BagIt)
   2. Extract it with `tar zxf Archive-BagIt-0.065.tar.gz` and go to project dir with `cd in Archive-BagIt-0.065`