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-rw-r--r--rest_framework/metadata.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/rest_framework/metadata.py b/rest_framework/metadata.py
index bf3611aa..b2c48b81 100644
--- a/rest_framework/metadata.py
+++ b/rest_framework/metadata.py
@@ -36,6 +36,7 @@ class SimpleMetadata(BaseMetadata):
label_lookup = ClassLookupDict({
serializers.Field: 'field',
serializers.BooleanField: 'boolean',
+ serializers.NullBooleanField: 'boolean',
serializers.CharField: 'string',
serializers.URLField: 'url',
serializers.EmailField: 'email',