Merge branch '2.4.0' of github.com:tomchristie/django-rest-framework into #1559

Conflicts:
	docs/topics/release-notes.md

1 files changed, 5 insertions, 2 deletions

diff --git a/docs/api-guide/fields.md b/docs/api-guide/fields.md
index 67fa65d2..4825d9c8 100644
--- a/docs/api-guide/fields.md
+++ b/docs/api-guide/fields.md
@@ -164,11 +164,12 @@ Corresponds to `django.db.models.fields.BooleanField`.
 ## CharField
 
 A text representation, optionally validates the text to be shorter than `max_length` and longer than `min_length`.
+If `allow_none` is `False` (default), `None` values will be converted to an empty string.
 
 Corresponds to `django.db.models.fields.CharField`
 or `django.db.models.fields.TextField`.
 
-**Signature:** `CharField(max_length=None, min_length=None)`
+**Signature:** `CharField(max_length=None, min_length=None, allow_none=False)`
 
 ## URLField
 
@@ -184,7 +185,9 @@ Corresponds to `django.db.models.fields.SlugField`.
 
 ## ChoiceField
 
-A field that can accept a value out of a limited set of choices.
+A field that can accept a value out of a limited set of choices. Optionally takes a `blank_display_value` parameter that customizes the display value of an empty choice.
+
+**Signature:** `ChoiceField(choices=(), blank_display_value=None)`
 
 ## EmailField