From 770ed3de2ef8339ec0b74f7eb522283718e01a3b Mon Sep 17 00:00:00 2001
From: Ryan Kaskel
Date: Sat, 18 May 2013 13:11:40 +0100
Subject: ToMany fields default to read-only if targeting ManyToManyField.

---
 docs/api-guide/relations.md | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'docs/api-guide')

diff --git a/docs/api-guide/relations.md b/docs/api-guide/relations.md
index 155c89de..99fe1083 100644
--- a/docs/api-guide/relations.md
+++ b/docs/api-guide/relations.md
@@ -381,6 +381,15 @@ Note that reverse generic keys, expressed using the `GenericRelation` field, can
 
 For more information see [the Django documentation on generic relations][generic-relations].
 
+## ManyToManyFields with a Through Model
+
+By default, relational fields that target a ``ManyToManyField`` with a
+``through`` model specified are set to read-only.
+
+If you exlicitly specify a relational field pointing to a
+``ManyToManyField`` with a through model, be sure to set ``read_only``
+to ``True``.
+
 ## Advanced Hyperlinked fields
 
 If you have very specific requirements for the style of your hyperlinked relationships you can override `HyperlinkedRelatedField`. 
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