diff --git a/docs/adr/adr-009-public-api.md b/docs/adr/adr-009-public-api.md
index 76bb1c5ab9..d2bf6ee817 100644
--- a/docs/adr/adr-009-public-api.md
+++ b/docs/adr/adr-009-public-api.md
@@ -100,7 +100,7 @@ GetByHeight(ctx context.Context, height uint64) (*header.ExtendedHeader, error)
 // WaitForHeight blocks until the header at the given height has been processed
 // by the node's header store or until context deadline is exceeded.
 WaitForHeight(ctx context.Context, height uint64) (*header.ExtendedHeader, error)
-// GetVerifiedRangeByHeight returns the given range [from:to) of ExtendedHeaders
+// GetVerifiedRangeByHeight returns the given range (from:to) of ExtendedHeaders
 // from the node's header store and verifies that the returned headers are 
 // adjacent to each other.
 GetVerifiedRangeByHeight(ctx context.Context, from, to uint64) ([]*ExtendedHeader, error)
diff --git a/nodebuilder/header/header.go b/nodebuilder/header/header.go
index d7eb7b5b46..9b9455da26 100644
--- a/nodebuilder/header/header.go
+++ b/nodebuilder/header/header.go
@@ -19,7 +19,7 @@ type Module interface {
 
 	// GetByHash returns the header of the given hash from the node's header store.
 	GetByHash(ctx context.Context, hash libhead.Hash) (*header.ExtendedHeader, error)
-	// GetVerifiedRangeByHeight returns the given range [from:to) of ExtendedHeaders
+	// GetVerifiedRangeByHeight returns the given range (from:to) of ExtendedHeaders
 	// from the node's header store and verifies that the returned headers are
 	// adjacent to each other.
 	GetVerifiedRangeByHeight(