diff --git a/blocklist.go b/blocklist.go
index 84f7ec5..cb06c37 100644
--- a/blocklist.go
+++ b/blocklist.go
@@ -35,6 +35,7 @@ type Config struct {
 }
 
 // NewConfig creates a new Config with default values.
+// limit is the maximum number of items to process or validate. 0 means no limit.
 func NewConfig(limit uint) Config {
 	return Config{
 		Limit:          limit,