diff --git a/src/__tests__/pinecone.test.ts b/src/__tests__/pinecone.test.ts
index e23c8a81..6709a7fd 100644
--- a/src/__tests__/pinecone.test.ts
+++ b/src/__tests__/pinecone.test.ts
@@ -100,12 +100,13 @@ describe('Pinecone', () => {
     });
 
     describe('optional properties', () => {
-      test('should not throw when optional properties provided: fetchAPI, controllerHostUrl', () => {
+      test('should not throw when optional properties provided: fetchAPI, controllerHostUrl, sourceTag', () => {
         expect(() => {
           new Pinecone({
             apiKey: 'test-key',
             fetchApi: utils.getFetch({} as PineconeConfiguration),
             controllerHostUrl: 'https://foo-bar.io',
+            sourceTag: 'test-tag-123',
           } as PineconeConfiguration);
         }).not.toThrow();
       });
diff --git a/src/data/types.ts b/src/data/types.ts
index 215bd082..3251c1f6 100644
--- a/src/data/types.ts
+++ b/src/data/types.ts
@@ -14,6 +14,7 @@ export const PineconeConfigurationSchema = Type.Object(
     fetchApi: Type.Optional(Type.Any()),
 
     additionalHeaders: Type.Optional(Type.Any()),
+    sourceTag: Type.Optional(Type.String({ minLength: 1 })),
   },
   { additionalProperties: false }
 );