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Update doctrine.rst #10325

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6 changes: 4 additions & 2 deletions doctrine.rst
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Expand Up @@ -162,8 +162,10 @@ Woh! You now have a new ``src/Entity/Product.php`` file::

.. caution::

MySQL sets a `limit of 767 bytes for the index key prefix`_. When using
``utf8mb4``, string columns with 255 character length surpass that limit.
There is a `limit of 767 bytes for the index key prefix`_ for InnoDB table on MySQL 5.6
and priort version. In MySQL version 5.7 and upwards this limit has been increased
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Priort -> prior

to 3072 bytes. If you are using MySQL version prior to 5.7 please take this into account:
When using ``utf8mb4``, string columns with 255 character length surpass that limit.
This means that any column of type ``string`` and ``unique=true`` must
set its maximum ``length`` to ``190``. Otherwise, you'll see this error:
*"[PDOException] SQLSTATE[42000]: Syntax error or access violation:
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