diff --git a/src/models/IntransitiveActivity.model.ts b/src/models/IntransitiveActivity.model.ts
deleted file mode 100644
index 2e16d92..0000000
--- a/src/models/IntransitiveActivity.model.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import {ASBase} from "./ASBase.model";
-import {ASObjectFields} from "./asObject/ASObject.model";
-
-// TODO: types
-// https://www.w3.org/TR/activitystreams-core/#intransitiveactivities
-export interface IntransitiveActivityFields extends ASObjectFields {
-    actor?: any; // Actor?
-    target?: any;
-    origin?: any;
-    result?: any;
-    instrument?: any;
-}
-
-export class IntransitiveActivity extends ASBase<IntransitiveActivityFields>{
-    constructor(fields: IntransitiveActivityFields) {
-        super(fields);
-    }
-}
\ No newline at end of file
diff --git a/src/models/IntransitiveActivity/IntransitiveActivity.model.ts b/src/models/IntransitiveActivity/IntransitiveActivity.model.ts
new file mode 100644
index 0000000..040b7df
--- /dev/null
+++ b/src/models/IntransitiveActivity/IntransitiveActivity.model.ts
@@ -0,0 +1,15 @@
+import {ASBase} from "../ASBase.model";
+import {IntransitiveActivityFields} from './IntransitiveActivity.types';
+
+/**
+ * Instances of IntransitiveActivity are a subtype of
+ * Activity representing intransitive actions. The
+ * object property is therefore inappropriate for these activities.
+ *
+ * {@link https://www.w3.org/ns/activitystreams#IntransitiveActivity Docs}
+ */
+export class IntransitiveActivity extends ASBase<IntransitiveActivityFields>{
+    constructor(fields: IntransitiveActivityFields) {
+        super(fields);
+    }
+}
\ No newline at end of file
diff --git a/src/models/IntransitiveActivity/IntransitiveActivity.types.ts b/src/models/IntransitiveActivity/IntransitiveActivity.types.ts
new file mode 100644
index 0000000..2c91140
--- /dev/null
+++ b/src/models/IntransitiveActivity/IntransitiveActivity.types.ts
@@ -0,0 +1,3 @@
+import {ActivityFields} from "../activity/Activity.types";
+
+export interface IntransitiveActivityFields extends Omit<ActivityFields, 'object'> {}