diff --git a/configuration/kresd.conf b/configuration/kresd.conf
index 2e40630..81ace6b 100644
--- a/configuration/kresd.conf
+++ b/configuration/kresd.conf
@@ -14,7 +14,7 @@ modules = {
 	'predict',          -- Prefetch expiring/frequent records
 }
 
--- Cache size
+-- Cache size https://knot-resolver.readthedocs.io/en/stable/daemon-bindings-cache.html#sizing
 cache.size = 100 * MB
 
 -- policy help : https://knot-resolver.readthedocs.io/en/stable/modules-policy.html