diff --git a/openedx_events/content_authoring/data.py b/openedx_events/content_authoring/data.py
index e55cc871..4fc3b899 100644
--- a/openedx_events/content_authoring/data.py
+++ b/openedx_events/content_authoring/data.py
@@ -191,9 +191,13 @@ class ContentObjectData:
         object_id (str): identifier of the Content object. This represents the id of the course or library block
         as a string. For example:
         block-v1:SampleTaxonomyOrg2+STC1+2023_1+type@vertical+block@f8de78f0897049ce997777a3a31b6ea0
+
+        changes: list of changes made to this ContentObject, e.g. "tags", "collections", "metadata"
+        If list is empty, assume everything has changed.
     """
 
     object_id = attr.ib(type=str)
+    changes = attr.ib(type=List[str], factory=list)
 
 
 @attr.s(frozen=True)
diff --git a/openedx_events/content_authoring/signals.py b/openedx_events/content_authoring/signals.py
index 2b00ea15..05366c4c 100644
--- a/openedx_events/content_authoring/signals.py
+++ b/openedx_events/content_authoring/signals.py
@@ -201,12 +201,13 @@
     }
 )
 
-# .. event_type: org.openedx.content_authoring.content.object.tags.changed.v1
-# .. event_name: CONTENT_OBJECT_TAGS_CHANGED
-# .. event_description: emitted when an object's tags are changed
+# .. event_type: org.openedx.content_authoring.content.object.associations.changed.v1
+# .. event_name: CONTENT_OBJECT_ASSOCIATIONS_CHANGED
+# .. event_description: emitted when an object's associations are changed.
+#    See content_object.changes for what changed, e.g "tags", "collections"
 # .. event_data: ContentObjectData
-CONTENT_OBJECT_TAGS_CHANGED = OpenEdxPublicSignal(
-    event_type="org.openedx.content_authoring.content.object.tags.changed.v1",
+CONTENT_OBJECT_ASSOCIATIONS_CHANGED = OpenEdxPublicSignal(
+    event_type="org.openedx.content_authoring.content.object.associations.changed.v1",
     data={
         "content_object": ContentObjectData
     }
diff --git a/openedx_events/event_bus/avro/tests/schemas/org+openedx+content_authoring+content+object+tags+changed+v1_schema.avsc b/openedx_events/event_bus/avro/tests/schemas/org+openedx+content_authoring+content+object+associations+changed+v1_schema.avsc
similarity index 62%
rename from openedx_events/event_bus/avro/tests/schemas/org+openedx+content_authoring+content+object+tags+changed+v1_schema.avsc
rename to openedx_events/event_bus/avro/tests/schemas/org+openedx+content_authoring+content+object+associations+changed+v1_schema.avsc
index e7e3c156..3dc385d3 100644
--- a/openedx_events/event_bus/avro/tests/schemas/org+openedx+content_authoring+content+object+tags+changed+v1_schema.avsc
+++ b/openedx_events/event_bus/avro/tests/schemas/org+openedx+content_authoring+content+object+associations+changed+v1_schema.avsc
@@ -12,10 +12,17 @@
           {
             "name": "object_id",
             "type": "string"
+          },
+          {
+            "name": "changes",
+            "type": {
+              "type": "array",
+              "items": "string"
+            }
           }
         ]
       }
     }
   ],
-  "namespace": "org.openedx.content_authoring.content.object.tags.changed.v1"
+  "namespace": "org.openedx.content_authoring.content.object.associations.changed.v1"
 }
\ No newline at end of file
diff --git a/openedx_events/event_bus/avro/tests/test_avro.py b/openedx_events/event_bus/avro/tests/test_avro.py
index 4d564b27..87634067 100644
--- a/openedx_events/event_bus/avro/tests/test_avro.py
+++ b/openedx_events/event_bus/avro/tests/test_avro.py
@@ -108,6 +108,7 @@ def generate_test_event_data_for_data_type(data_type):  # pragma: no cover
         LibraryLocatorV2: LibraryLocatorV2.from_string('lib:MITx:reallyhardproblems'),
         LibraryUsageLocatorV2: LibraryUsageLocatorV2.from_string('lb:MITx:reallyhardproblems:problem:problem1'),
         List[int]: [1, 2, 3],
+        List[str]: ["hi", "there"],
         datetime: datetime.now(),
         CCXLocator: CCXLocator(org='edx', course='DemoX', run='Demo_course', ccx='1'),
         UUID: uuid4(),