diff --git a/README.md b/README.md
index e458de9ee843ec6f96809ea439d695d03f49c065..90be502e8813fd7160be6a991311ba7596c21c33 100644
--- a/README.md
+++ b/README.md
@@ -128,7 +128,7 @@ SITE_URL = 'http://localhost:8000'
 BASE_URL = SITE_URL
 ```
 
-* `LDP_RDF_CONTEXT` tells DjangoLDP where our RDF [ontology](https://www.w3.org/standards/semanticweb/ontology) is defined, which will be returned as part of our views in the 'context' field. This is a web URL and you can visit the value to view the full ontology online
+* `LDP_RDF_CONTEXT` tells DjangoLDP where our RDF [ontology](https://www.w3.org/standards/semanticweb/ontology) is defined, which will be returned as part of our views in the 'context' field. This is a web URL and you can visit the value to view the full ontology online. The ontology can be a string, as in the example, but it can also be a dictionary, or a list of ontologies (see the [JSON-LD spec](https://json-ld.org) for examples)
 * `DJANGOLDP_PACKAGES` defines which other [DjangoLDP packages](https://git.happy-dev.fr/startinblox/djangoldp-packages) we're using in this installation
 * `SITE_URL` is the URL serving the site, e.g. `https://example.com/`. Note that if you include the DjangoLDP urls in a nested path (e.g. `https://example.com/api/`), then `SITE_URL` will need to be set to this value
 * `BASE_URL` may be different from SITE_URL, e.g. `https://example.com/app/`
@@ -280,6 +280,19 @@ class Meta:
 
 ### rdf_type
 
+Indicates the type the model corresponds to in the ontology. E.g. where `'hd:circle'` is defined in an ontology from `settings.LDP_RDF_CONTEXT`
+
+```python
+rdf_type = 'hd:circle'
+```
+
+### rdf_context
+
+Sets added `context` fields to be serialized with model instances
+```python
+rdf_context = {'picture': 'foaf:depiction'}
+```
+
 ### auto_author
 
 This property allows to associate a model with the logged in user.
diff --git a/djangoldp/activities/services.py b/djangoldp/activities/services.py
index 9bc509c9ccbdd97e012fd70d1c78130eb9ee7132..3f7d0e6f4bf0824deb148a402feb82b18cc0a739 100644
--- a/djangoldp/activities/services.py
+++ b/djangoldp/activities/services.py
@@ -33,7 +33,6 @@ class ActivityPubService(object):
             "@id": instance.urlid
         }
         if obj['@type'] is None:
-            logger.warning('[Backlink-Creation] model ' + str(model) + ' has no rdf_type')
             return
 
         # append relations
@@ -49,7 +48,6 @@ class ActivityPubService(object):
                 }
 
                 if sub_object['@type'] is None:
-                    logger.warning('[Backlink-Creation] model ' + str(type(value)) + ' has no rdf_type')
                     continue
 
                 obj[field_name] = sub_object
@@ -256,7 +254,6 @@ def _check_instance_for_backlinks(sender, instance):
 
     # bounds checking
     if not hasattr(instance, 'urlid') or Model.get_model_rdf_type(sender) is None:
-        logger.warning('[Create-Backlink] model ' + str(sender) + ' has no rdf_type')
         return {}
 
     # check each foreign key for a distant resource
@@ -269,7 +266,6 @@ def _check_instance_for_backlinks(sender, instance):
                 target_type = Model.get_model_rdf_type(type(value))
 
                 if target_type is None:
-                    logger.warning('[Create-Backlink] model ' + str(type(value)) + ' has no rdf_type')
                     continue
 
                 targets[value.urlid] = ActivityPubService._discover_inbox(value.urlid)
@@ -345,10 +341,8 @@ def check_m2m_for_backlinks(sender, instance, action, *args, **kwargs):
         container_rdf_type = Model.get_model_rdf_type(type(instance))
 
         if member_rdf_type is None:
-            logger.warning('[Backlink-Creation] model ' + str(member_model) + ' has no rdf_type')
             return
         if container_rdf_type is None:
-            logger.warning('[Backlink-Creation] model ' + str(type(instance)) + ' has no rdf_type')
             return
 
         # build list of targets (models affected by the change)