Update frequently-asked-questions.rst

1 files changed, 7 insertions, 6 deletions

diff --git a/docs/frequently-asked-questions.rst b/docs/frequently-asked-questions.rst
index b1ca04ff..fc7d7b7f 100644
--- a/docs/frequently-asked-questions.rst
+++ b/docs/frequently-asked-questions.rst
@@ -666,21 +666,22 @@ gas and return your 20 Wei).
 In the above example, the low-level function `call` is used to invoke another
 contract with `p.data` as payload and `p.amount` Wei is sent with that call.
 
-What happens to a mapping copied from a mapping of structs?
-===========================================================
+What happens to a struct's mapping when copying over a struct?
+==============================================================
 
 This is a very interesting question. Suppose that we have a contract field set up like such::
 
     struct user{
         mapping(string => address) usedContracts;
     }
-    mapping(uint => user) userList;
     function somefunction{
-       user userA = userList[1];
-       userList[2] = userA;
+       user user1;
+       user1.usedContracts["Hello"] = "World";
+       user user2 = user1;
     }
 
-In this case, the mapping of the struct being copied over into the userList is ignored.
+In this case, the mapping of the struct being copied over into the userList is ignored as there is no "list of mapped keys".
+Therefore it is not possible to find out which values should be copied over.
 
 How do I initialize a contract with only a specific amount of wei?
 ==================================================================