Update eip-1712.md

EIPS/eip-1712.md

@@ -18,11 +18,15 @@ mostly argue that deploying unused opcode is not of much use so no
 sane developers would do that, it would be better to just disallow
 deployment of unused opcodes.
 
+By only checking before adding contract code to the state, but not when
+executing a contract creation transaction, we make sure this is
+compatible with the current Solidity behavior of appending a metadata
+hash to the end of bytecodes.
+
 ## Specification
 
-After `HARD_FORK` number, before executing a contract creation
-transaction, or adding contract code to the state, do the following
-check:
+After `HARD_FORK` number, before adding contract code to the state, 
+do the following check:
 
 * Iterate over the code bytes one by one.
   * If the code byte is a PUSH(n) opcode, skip next n bytes.