diff --git a/google/cloud/vision/v1/product_search.proto b/google/cloud/vision/v1/product_search.proto
index 74c0b188a6..8e096fd232 100644
--- a/google/cloud/vision/v1/product_search.proto
+++ b/google/cloud/vision/v1/product_search.proto
@@ -43,8 +43,9 @@ message ProductSearchParams {
   string product_set = 6;
 
   // The list of product categories to search in. Currently, we only consider
-  // the first category, and either "homegoods", "apparel", or "toys" should be
-  // specified.
+  // the first category, and either "homegoods-v2", "apparel-v2", or "toys-v2"
+  // should be specified. The legacy categories "homegoods", "apparel", and
+  // "toys" are still supported, but these should not be used for new products.
   repeated string product_categories = 7;
 
   // The filtering expression. This can be used to restrict search results based
diff --git a/google/cloud/vision/v1/product_search_service.proto b/google/cloud/vision/v1/product_search_service.proto
index 9b62fac228..ae36bf157e 100644
--- a/google/cloud/vision/v1/product_search_service.proto
+++ b/google/cloud/vision/v1/product_search_service.proto
@@ -337,7 +337,9 @@ message Product {
   string description = 3;
 
   // The category for the product identified by the reference image. This should
-  // be either "homegoods", "apparel", or "toys".
+  // be either "homegoods-v2", "apparel-v2", or "toys-v2". The legacy categories
+  // "homegoods", "apparel", and "toys" are still supported, but these should
+  // not be used for new products.
   //
   // This field is immutable.
   string product_category = 4;
diff --git a/google/cloud/vision/v1p4beta1/product_search.proto b/google/cloud/vision/v1p4beta1/product_search.proto
index 007804f312..f006dd4613 100644
--- a/google/cloud/vision/v1p4beta1/product_search.proto
+++ b/google/cloud/vision/v1p4beta1/product_search.proto
@@ -44,8 +44,10 @@ message ProductSearchParams {
   string product_set = 6;
 
   // The list of product categories to search in. Currently, we only consider
-  // the first category, and either "homegoods", "apparel", or "toys" should be
-  // specified.
+  // the first category, and either "homegoods-v2", "apparel-v2", "toys-v2", or
+  // "packagedgoods" should be specified. The legacy categories "homegoods",
+  // "apparel", and "toys" are still supported, but these should not be used for
+  // new products.
   repeated string product_categories = 7;
 
   // The filtering expression. This can be used to restrict search results based
diff --git a/google/cloud/vision/v1p4beta1/product_search_service.proto b/google/cloud/vision/v1p4beta1/product_search_service.proto
index e3b23c7b30..74bd86bce5 100644
--- a/google/cloud/vision/v1p4beta1/product_search_service.proto
+++ b/google/cloud/vision/v1p4beta1/product_search_service.proto
@@ -355,7 +355,9 @@ message Product {
   string description = 3;
 
   // The category for the product identified by the reference image. This should
-  // be either "homegoods", "apparel", or "toys".
+  // be either "homegoods-v2", "apparel-v2", "toys-v2", or "packagedgoods". The
+  // legacy categories "homegoods", "apparel", and "toys" are still supported,
+  // but these should not be used for new products.
   //
   // This field is immutable.
   string product_category = 4;