diff --git a/apirel.go b/apirel.go
new file mode 100644
index 0000000..bb4d857
--- /dev/null
+++ b/apirel.go
@@ -0,0 +1,32 @@
+/*
+   Copyright (c) 2020 gingfrederik
+   Copyright (c) 2021 Gonzalo Fernandez-Victorio
+   Copyright (c) 2021 Basement Crowd Ltd (https://www.basementcrowd.com)
+   Copyright (c) 2023 Fumiama Minamoto (源文雨)
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package docx
+
+// RangeRelationships goes through each doc relation
+func (f *Docx) RangeRelationships(iter func(*Relationship) error) error {
+	for _, r := range f.docRelation.Relationship {
+		err := iter(&r)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}