1 files changed, 12 insertions, 1 deletions

diff --git a/bank-eiffel/studentaccount.e b/bank-eiffel/studentaccount.e
index 04a9e31..abbb070 100644
--- a/bank-eiffel/studentaccount.e
+++ b/bank-eiffel/studentaccount.e
@@ -4,12 +4,23 @@ class
 inherit
         ACCOUNT
                 redefine
-                        set_default_transfer_minamount
+                        set_default_transfer_minamount,
+                        add_authorized_signer
                 end
 
 create
         make
 
+feature -- Basic operations
+
+        add_authorized_signer (an_authorized_signer: PERSON)
+                do
+                        check
+                                authorized_signers_only_one: get_authorized_signers.count = 0
+                        end
+                        Precursor (an_authorized_signer)
+                end
+
 feature {NONE} -- Implementation
 
         set_default_transfer_minamount