README: Add notes for annotation config

dveeden · dveeden · commit 1087a7c8a83b · 2025-02-16T17:46:01.000+01:00
Signed-off-by: Daniël van Eeden &lt;git@myname.nl&gt;
diff --git a/README.md b/README.md
@@ -512,6 +512,8 @@ permissions:
   checks: write
 ```
 
+For annotations to work use the default `colored-line-number` output and either use `actions/setup-go` in the job or enable the internal [problem matchers](#problem-matchers).
+
 ## Performance
 
 The action was implemented with performance in mind:
