diff --git a/.zenodo.json b/.zenodo.json
index ea3f682..0c7a17b 100644
--- a/.zenodo.json
+++ b/.zenodo.json
@@ -21,6 +21,13 @@
         "multipoles",
         "electric field"
     ],
+    "related_identifiers": [
+        {
+            "identifier": "10.1039/c9cp03875b",
+            "relation": "isSupplementTo",
+            "scheme": "doi"
+        }
+    ],
     "license": "mit-license",
     "upload_type": "software"
 }
diff --git a/README.md b/README.md
index 144a5ec..a4d5b33 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ Class name      | Link
 `qPotential`    | https://arxiv.org/abs/1904.10335
 `ReactionField` | http://doi.org/dbs99w
 `Wolf`          | http://doi.org/cfcxdk
-`Zahn`          | http://
+`Zahn`          | http://doi.org/10.1021/jp025949h
 `ZeroDipole`    | http://
 `Splined`       | Splined version of any of the above