diff --git a/src/file/relationships/relationship/relationship.ts b/src/file/relationships/relationship/relationship.ts
index e40d43bc5b..e3ac807946 100644
--- a/src/file/relationships/relationship/relationship.ts
+++ b/src/file/relationships/relationship/relationship.ts
@@ -8,7 +8,8 @@ export type RelationshipType =
     | "http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"
     | "http://schemas.openxmlformats.org/officeDocument/2006/relationships/fontTable"
     | "http://schemas.openxmlformats.org/officeDocument/2006/relationships/webSettings"
-    | "http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering";
+    | "http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering"
+    | "http://schemas.openxmlformats.org/officeDocument/2006/relationships/header";
 
 export class Relationship extends XmlComponent {
     constructor(id: string, type: RelationshipType, target: string) {