diff --git a/lib/pardot/objects/list_memberships.rb b/lib/pardot/objects/list_memberships.rb
index db0354c..afde759 100644
--- a/lib/pardot/objects/list_memberships.rb
+++ b/lib/pardot/objects/list_memberships.rb
@@ -1,3 +1,5 @@
+# Modified to create a new list membership as "create" under the MIT license.
+
 module Pardot
   module Objects
     module ListMemberships
@@ -22,6 +24,10 @@ def read_by_id id, params = {}
           get "/do/read/id/#{id}", params
         end
 
+        def create list_id, prospect_id, params = {}
+          post "/do/create/list_id/#{list_id}/prospect_id/#{prospect_id}", params
+        end
+
         protected
 
         def get path, params = {}, result = "listMembership"
@@ -29,6 +35,11 @@ def get path, params = {}, result = "listMembership"
           result ? response[result] : response
         end
 
+        def post path, params = {}, result = "listMembership"
+          response = @client.post "listMembership", path, params
+          result ? response[result] : response
+        end
+
       end
 
     end