diff --git a/pkg/storage/chunk/cache/cache.go b/pkg/storage/chunk/cache/cache.go
index 8fe3d0e63aaa..dfc926b583b4 100644
--- a/pkg/storage/chunk/cache/cache.go
+++ b/pkg/storage/chunk/cache/cache.go
@@ -14,12 +14,6 @@ import (
 )
 
 // Cache byte arrays by key.
-//
-// NB we intentionally do not return errors in this interface - caching is best
-// effort by definition.  We found that when these methods did return errors,
-// the caller would just log them - so its easier for implementation to do that.
-// Whatsmore, we found partially successful Fetchs were often treated as failed
-// when they returned an error.
 type Cache interface {
 	Store(ctx context.Context, key []string, buf [][]byte) error
 	Fetch(ctx context.Context, keys []string) (found []string, bufs [][]byte, missing []string, err error)