diff --git a/trie/iterator.go b/trie/iterator.go
index 76146c0d64..ed91f24746 100644
--- a/trie/iterator.go
+++ b/trie/iterator.go
@@ -73,7 +73,7 @@ type NodeIterator interface {
 	// For leaf nodes, the last element of the path is the 'terminator symbol' 0x10.
 	Path() []byte
 
-	// Leaf returns true iff the current node is a leaf node.
+	// Leaf returns true if the current node is a leaf node.
 	// LeafBlob, LeafKey return the contents and key of the leaf node. These
 	// method panic if the iterator is not positioned at a leaf.
 	// Callers must not retain references to their return value after calling Next