diff --git a/reference/forms/types/country.rst b/reference/forms/types/country.rst
index dbf2a87cc5b..d6b3f921f2d 100644
--- a/reference/forms/types/country.rst
+++ b/reference/forms/types/country.rst
@@ -22,6 +22,7 @@ the option manually, but then you should just use the ``ChoiceType`` directly.
 | Rendered as | can be various tags (see :ref:`forms-reference-choice-tags`)          |
 +-------------+-----------------------------------------------------------------------+
 | Options     | - `choice_translation_locale`_                                        |
+|             | - `alpha3`_                                                           |
 +-------------+-----------------------------------------------------------------------+
 | Overridden  | - `choices`_                                                          |
 | options     |                                                                       |
@@ -64,6 +65,8 @@ Field Options
 
 .. include:: /reference/forms/types/options/choice_translation_locale.rst.inc
 
+.. include:: /reference/forms/types/options/alpha3.rst.inc
+
 Overridden Options
 ------------------
 
diff --git a/reference/forms/types/language.rst b/reference/forms/types/language.rst
index 7aee017fcce..a4ea81d572d 100644
--- a/reference/forms/types/language.rst
+++ b/reference/forms/types/language.rst
@@ -24,6 +24,7 @@ manually, but then you should just use the ``ChoiceType`` directly.
 | Rendered as | can be various tags (see :ref:`forms-reference-choice-tags`)           |
 +-------------+------------------------------------------------------------------------+
 | Options     | - `choice_translation_locale`_                                         |
+|             | - `alpha3`_                                                            |
 +-------------+------------------------------------------------------------------------+
 | Overridden  | - `choices`_                                                           |
 | options     |                                                                        |
@@ -66,6 +67,8 @@ Field Options
 
 .. include:: /reference/forms/types/options/choice_translation_locale.rst.inc
 
+.. include:: /reference/forms/types/options/alpha3.rst.inc
+
 Overridden Options
 ------------------
 
diff --git a/reference/forms/types/options/alpha3.rst.inc b/reference/forms/types/options/alpha3.rst.inc
new file mode 100644
index 00000000000..542dfef1901
--- /dev/null
+++ b/reference/forms/types/options/alpha3.rst.inc
@@ -0,0 +1,7 @@
+alpha3
+~~~~~~
+
+**type**: ``boolean`` **default**: ``false``
+
+This option determines if the choice values should be in the alpha3 instead 
+of the alpha2 format.