diff --git a/ckan/logic/action/create.py b/ckan/logic/action/create.py
index 977d5f66038..fe107aa5197 100644
--- a/ckan/logic/action/create.py
+++ b/ckan/logic/action/create.py
@@ -1140,10 +1140,13 @@ def group_member_create(context, data_dict):
 
     You must be authorized to edit the group.
 
-    :param id: the id or name of the group
-    :param username: name or id of the user to be made member of the group
+    :param id: the id or name of the group.
+    :type id: string
+    :param username: name or id of the user to be made member of the group.
+    :type username: string
     :param role: role of the user in the group. One of ``member``, ``editor``,
         or ``admin``.
+    :type role: string
 
     :returns: the newly created (or updated) membership
     :rtype: dictionary
@@ -1156,11 +1159,14 @@ def organization_member_create(context, data_dict):
 
     You must be authorized to edit the organization.
 
-    :param id: the id or name of the organization
+    :param id: the id or name of the organization.
+    :type id: string
     :param username: name or id of the user to be made member of the
-        organization
+        organization.
+    :type username: string
     :param role: role of the user in the organization. One of ``member``,
         ``editor``, or ``admin``.
+    :type role: string
 
     :returns: the newly created (or updated) membership
     :rtype: dictionary
diff --git a/ckan/logic/action/delete.py b/ckan/logic/action/delete.py
index 39cbd7e4cf1..3dddf7584bc 100644
--- a/ckan/logic/action/delete.py
+++ b/ckan/logic/action/delete.py
@@ -418,7 +418,7 @@ def _group_or_org_member_delete(context, data_dict=None):
 
     group_id = data_dict.get('id')
     group = model.Group.get(group_id)
-    user_id = data_dict.get('user_id')
+    user_id = data_dict.get('username')
     member_dict = {
         'id': group.id,
         'object': user_id,
@@ -433,23 +433,27 @@ def _group_or_org_member_delete(context, data_dict=None):
 
 
 def group_member_delete(context, data_dict=None):
-    '''Remove a user from a group
+    '''Remove a user from a group.
 
     You must be authorized to edit the group.
 
-    :param id: the id or name of the group
-    :param username: name or id of the user to be removed
+    :param id: the id or name of the group.
+    :type id: string
+    :param username: name or id of the user to be removed.
+    :type username: string
 
     '''
     return _group_or_org_member_delete(context, data_dict)
 
 def organization_member_delete(context, data_dict=None):
-    '''Remove a user from a organization
+    '''Remove a user from a organization.
 
     You must be authorized to edit the organization.
 
-    :param id: the id or name of the organization
-    :param username: name or id of the user to be removed
+    :param id: the id or name of the organization.
+    :type id: string
+    :param username: name or id of the user to be removed.
+    :type username: string
 
     '''
     return _group_or_org_member_delete(context, data_dict)
diff --git a/ckan/logic/action/get.py b/ckan/logic/action/get.py
index 1c8ae2530e2..5e6aeffb39e 100644
--- a/ckan/logic/action/get.py
+++ b/ckan/logic/action/get.py
@@ -658,10 +658,13 @@ def user_list(context, data_dict):
 def package_relationships_list(context, data_dict):
     '''Return a dataset (package)'s relationships.
 
-    :param id: the id or name of the first package
-    :param id2: the id or name of the second package
-    :param rel: relationship as string see ``package_relationship_create()``
-        for the relationship types (optional)
+    :param id: the id or name of the first package.
+    :type id: string
+    :param id2: the id or name of the second package.
+    :type id: string
+    :param rel: relationship as string see
+        :func:`ckan.logic.action.create.package_relationship_create()` for the
+        relationship types (optional).
 
     :rtype: list of dictionaries