diff --git a/eth/filters/api.go b/eth/filters/api.go
index 4b36a5379..e0b07e318 100644
--- a/eth/filters/api.go
+++ b/eth/filters/api.go
@@ -72,8 +72,8 @@ func NewPublicFilterAPI(backend Backend, lightMode bool, timeout time.Duration)
 	return api
 }
 
-// timeoutLoop runs every 5 minutes and deletes filters that have not been recently used.
-// Tt is started when the api is created.
+// timeoutLoop runs at the interval set by 'timeout' and deletes filters
+// that have not been recently used. It is started when the API is created.
 func (api *PublicFilterAPI) timeoutLoop(timeout time.Duration) {
 	var toUninstall []*Subscription
 	ticker := time.NewTicker(timeout)