diff --git a/README.md b/README.md
index 0fdda92..e82ee98 100644
--- a/README.md
+++ b/README.md
@@ -18,4 +18,4 @@ The [contribution guidelines](https://github.com/cloudscape-design/documenter/bl
 
 ## License
 
-This project is licensed under the [Apache 2.0 License](/LICENSE)
\ No newline at end of file
+This project is licensed under the [Apache 2.0 License](/LICENSE).
\ No newline at end of file
diff --git a/src/schema/code.ts b/src/schema/code.ts
index 4a25889..c76cedb 100644
--- a/src/schema/code.ts
+++ b/src/schema/code.ts
@@ -68,7 +68,7 @@ export function buildType(type?: Type, enclose = false): string {
     }
     return type.type;
   }
-  return 'unknown';
+  return 'known';
 }
 
 export function buildNodeDescription(node: Reflection): string | undefined {
diff --git a/test/hooks/hooks.test.ts b/test/hooks/hooks.test.ts
index 082aac8..b0da773 100644
--- a/test/hooks/hooks.test.ts
+++ b/test/hooks/hooks.test.ts
@@ -22,4 +22,8 @@ describe('Build code from type', () => {
       expect(code).toMatchSnapshot();
     })
   );
+
+  test('unknown', () => {
+    expect(schema.code.buildType(undefined)).toBe('known');
+  });
 });