diff --git a/performance.rst b/performance.rst
index 5b4b01eb48d..093c46261a9 100644
--- a/performance.rst
+++ b/performance.rst
@@ -168,6 +168,12 @@ For more details, see :doc:`/components/class_loader/cache_class_loader`.
Use Bootstrap Files
-------------------
+.. caution::
+
+ The performance optimalizations in PHP 7 removed any overhead. As such,
+ using the bootstrap file is discouraged when using PHP 7+ and was
+ deprecated in Symfony 3.3 and it will be removed in 4.0.
+
To ensure optimal flexibility and code reuse, Symfony applications leverage
a variety of classes and 3rd party components. But loading all of these classes
from separate files on each request can result in some overhead. To reduce
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