Minor updates in comments, so it is clearer.

src/Services/Catalog/Catalog.API/Controllers/CatalogController.cs

@@ -180,7 +180,7 @@ namespace Microsoft.eShopOnContainers.Services.Catalog.API.Controllers
             catalogItem = productToUpdate;
             _catalogContext.CatalogItems.Update(catalogItem);
 
-            if (raiseProductPriceChangedEvent) // Save and publish integration event if price has changed
+            if (raiseProductPriceChangedEvent) // Save product's data and publish integration event through the Event Bus if price has changed
             {
                 //Create Integration Event to be published through the Event Bus
                 var priceChangedEvent = new ProductPriceChangedIntegrationEvent(catalogItem.Id, productToUpdate.Price, oldPrice);
@@ -191,7 +191,7 @@ namespace Microsoft.eShopOnContainers.Services.Catalog.API.Controllers
                 // Publish through the Event Bus and mark the saved event as published
                 await _catalogIntegrationEventService.PublishThroughEventBusAsync(priceChangedEvent);
             }
-            else // Save updated product
+            else // Just save the updated product because the Product's Price hasn't changed.
             {
                 await _catalogContext.SaveChangesAsync();
             }