add documentation on using the param when testing local files (as in …

…alternate)

README.md

@@ -73,6 +73,16 @@ jobs:
           fail: true
 ```
 
+You may want to add additional arguments to the above.  In particular if you're testing a site directly from the file-system (as in the above), you'll likely want to set the argument `--base .` to ensure that **all links** in the files are tested.  You don't need to do this if you're testing a hosted site.
+
+```
+      - name: Link Checker
+        uses: lycheeverse/[email protected]
+        with:
+          fail: true
+          args: "--verbose --no-progress './**/*.md' './**/*.html' './**/*.rst'" --base .
+```
+
 ## Passing arguments
 
 This action uses [lychee] for link checking.