Document byte[] vs bytes

docs/frequently-asked-questions.rst

@@ -441,13 +441,6 @@ The correct way to do this is the following::
         }
     }
 
-What is the difference between ``bytes`` and ``byte[]``?
-========================================================
-
-``bytes`` is usually more efficient: When used as arguments to functions (i.e. in
-CALLDATA) or in memory, every single element of a ``byte[]`` is padded to 32
-bytes which wastes 31 bytes per element.
-
 Is it possible to send a value while calling an overloaded function?
 ====================================================================
 

docs/types.rst

@@ -181,6 +181,10 @@ Members:
 
 * ``.length`` yields the fixed length of the byte array (read-only).
 
+.. note::
+    It is possible to use an array of bytes as ``byte[]``, but it is wasting a lot of space, 31 bytes every element,
+    to be exact, when passing in calls. It is better to use ``bytes``.
+
 Dynamically-sized byte array
 ----------------------------