diff --git a/.gitignore b/.gitignore
index 138f19ae..7b2ee3b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@ __pycache__/
 # Distribution / packaging
 .venv*/
 dist/
+venv/
 
 .DS_Store
 
diff --git a/examples/product_recommendation/main.py b/examples/product_recommendation/main.py
index 4c2b9123..3ee8a75e 100644
--- a/examples/product_recommendation/main.py
+++ b/examples/product_recommendation/main.py
@@ -94,8 +94,12 @@ class ProductTaxonomyInfo:
     - complementary_taxonomies: Think about when customers buy this product, what else they might need as complementary products. Put labels for these complentary products.
     """
 
-    taxonomies: list[ProductTaxonomy]
-    complementary_taxonomies: list[ProductTaxonomy]
+    taxonomies: list[ProductTaxonomy] = dataclasses.field(
+        metadata={"description": "Taxonomies for the current product."}
+    )
+    complementary_taxonomies: list[ProductTaxonomy] = dataclasses.field(
+        metadata={"description": "Think about when customers buy this product, what else they might need as complementary products. Put labels for these complentary products."}
+    )
 
 
 @cocoindex.op.function(behavior_version=2)