diff --git a/trie/stacktrie.go b/trie/stacktrie.go
index c19991b162..b84a31b010 100644
--- a/trie/stacktrie.go
+++ b/trie/stacktrie.go
@@ -157,6 +157,7 @@ const (
 	hashedNode
 )
 
+// emptyNodes is a pre-initialized array of nil pointers used to efficiently clear stNode children arrays during reset operations.
 var emptyNodes = [16]*stNode{}
 
 func (n *stNode) reset() *stNode {