diff --git a/src/coscine/client.py b/src/coscine/client.py
index 0cfb8499f7e9723e2d28ad416b7d410de68727a2..f4966357340ffb7256bc5d78a963f6ee9e5efc74 100644
--- a/src/coscine/client.py
+++ b/src/coscine/client.py
@@ -716,6 +716,8 @@ class ApiClient:
         organizations = []
         organizations.append(responsible_organization.serialize())
         organizations[0]["responsible"] = True
+        if additional_organizations is None:
+            additional_organizations = []
         for org in additional_organizations:
             organizations.append(org.serialize())
         data: dict = {
@@ -976,16 +978,16 @@ class ApiClient:
         """
         Looks up an organization based on its ror uri.
         Some commonly used ROR uris:
-        "https://ror.org/04xfq0f34" -> RWTH Aachen
-        "https://ror.org/04tqgg260" -> FH Aachen
-        "https://ror.org/04t3en479" -> KIT
-        "https://ror.org/02kkvpp62" -> TUM
-        "https://ror.org/05n911h24" -> TU Darm
-        "https://ror.org/01k97gp34" -> TU Do
-        "https://ror.org/02gm5zw39" -> UKA
-        "https://ror.org/00rcxh774" -> Uni Köln
-        "https://ror.org/04mz5ra38" -> Uni Due
-        "https://ror.org/00pd74e08" -> Uni Mün
+        * "https://ror.org/04xfq0f34" <- RWTH Aachen
+        * "https://ror.org/04tqgg260" <- FH Aachen
+        * "https://ror.org/04t3en479" <- KIT
+        * "https://ror.org/02kkvpp62" <- TUM
+        * "https://ror.org/05n911h24" <- TU Darm
+        * "https://ror.org/01k97gp34" <- TU Do
+        * "https://ror.org/02gm5zw39" <- UKA
+        * "https://ror.org/00rcxh774" <- Uni Köln
+        * "https://ror.org/04mz5ra38" <- Uni Due
+        * "https://ror.org/00pd74e08" <- Uni Mün
         """
         uri = self.uri("organizations", ror_uri)
         return Organization(self.get(uri).data)
@@ -1004,6 +1006,24 @@ class ApiClient:
     def license(self, name: str) -> License:
         """
         Returns the license that matches the name.
+        * "Apache License 2.0"
+        * "BSD 2-clause 'Simplified' License"
+        * "BSD 3-clause 'New' or 'Revised' License"
+        * "CC BY 4.0 (Attribution)"
+        * "CC BY NC 4.0 (Attribution-NonCommercial)"
+        * "CC BY NC ND 4.0 (Attribution-NonCommercial-NoDerivatives)"
+        * "CC BY NC SA 4.0 (Attribution-NonCommercial-ShareAlike)"
+        * "CC BY ND 4.0 (Attribution-NoDerivatives)"
+        * "CC BY SA 4.0 (Attribution-ShareAlike)"
+        * "Eclipse Public License 1.0"
+        * "GNU Affero General Public License v3.0"
+        * "GNU General Public License v2.0"
+        * "GNU General Public License v3.0"
+        * "GNU Lesser General Public License v2.1"
+        * "GNU Lesser General Public License v3.0"
+        * "MIT License"
+        * "Mozilla Public License 2.0"
+        * "The Unlicense"
         """
         results = list(filter(
             lambda license: license.name == name,