symfony
diff --git a/‎reference/forms/types/country.rst
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diff --git a/‎reference/forms/types/currency.rst
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diff --git a/‎reference/forms/types/language.rst
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diff --git a/‎reference/forms/types/locale.rst
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diff --git a/‎reference/forms/types/timezone.rst
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@@ -60,6 +60,12 @@ choices
 The country type defaults the ``choices`` option to the whole list of countries.
 The locale is used to translate the countries names.
 
+.. caution::
+
+    If you want to override the built-in choices of the country type, you
+    will also have to set the ``choice_loader`` option to ``null``. Not doing
+    so is deprecated since Symfony 3.3.
+
 Inherited Options
 -----------------
 
 
@@ -51,6 +51,12 @@ choices
 
 The choices option defaults to all currencies.
 
+.. caution::
+
+    If you want to override the built-in choices of the currency type, you
+    will also have to set the ``choice_loader`` option to ``null``. Not doing
+    so is deprecated since Symfony 3.3.
+
 Inherited Options
 -----------------
 
 
@@ -61,6 +61,12 @@ choices
 The choices option defaults to all languages.
 The default locale is used to translate the languages names.
 
+.. caution::
+
+    If you want to override the built-in choices of the language type, you
+    will also have to set the ``choice_loader`` option to ``null``. Not doing
+    so is deprecated since Symfony 3.3.
+
 Inherited Options
 -----------------
 
 
@@ -63,6 +63,12 @@ choices
 The choices option defaults to all locales. It uses the default locale to
 specify the language.
 
+.. caution::
+
+    If you want to override the built-in choices of the locale type, you
+    will also have to set the ``choice_loader`` option to ``null``. Not doing
+    so is deprecated since Symfony 3.3.
+
 Inherited Options
 -----------------
 
 
@@ -56,6 +56,12 @@ choices
 The Timezone type defaults the choices to all timezones returned by
 :phpmethod:`DateTimeZone::listIdentifiers`, broken down by continent.
 
+.. caution::
+
+    If you want to override the built-in choices of the timezone type, you
+    will also have to set the ``choice_loader`` option to ``null``. Not doing
+    so is deprecated since Symfony 3.3.
+
 Inherited Options
 -----------------