diff --git a/products/tests.py b/products/tests.py
index 07fbb63..fd40f26 100644
--- a/products/tests.py
+++ b/products/tests.py
@@ -526,15 +526,15 @@ class ProductSearchTest(TestCase):
 
     def test_anon_user_can_filter_shipping_cost_true(self):
         expected_instances = [
-            self.factory(tags="lunares/rojos", category='zapatos', description="zapatos verdes", shipping_cost=None),
             self.factory(tags="colores/rojos, tono/brillante", shipping_cost=100.00),
             self.factory(tags="lunares/azules", description="zapatos rojos", shipping_cost=12.00),
-            self.factory(tags="lunares/rojos", description="zapatos", shipping_cost=0.00),
             self.factory(attributes='"zapatos de campo", tono/oscuro', shipping_cost=9.00),
         ]
         unexpected_instances = [
             self.factory(description="chanclas"),
             self.factory(tags="azules"),
+            self.factory(tags="lunares/rojos", category='zapatos', description="zapatos verdes", shipping_cost=None),
+            self.factory(tags="lunares/rojos", description="zapatos", shipping_cost=0.00),
         ]
 
         query_string = quote("zapatos rojos")
@@ -546,19 +546,16 @@ class ProductSearchTest(TestCase):
         self.assertEqual(response.status_code, 200)
         # load response data
         payload = response.json()
-        self.assertEquals(len(payload['products']), 3)
+        self.assertEquals(len(payload['products']), len(expected_instances))
 
     def test_anon_user_can_filter_shipping_cost_false(self):
         expected_instances = [
             self.factory(tags="lunares/rojos", category='zapatos', description="zapatos verdes", shipping_cost=None),
-            self.factory(tags="colores/rojos, tono/brillante", shipping_cost=100.00),
-            self.factory(tags="lunares/azules", description="zapatos rojos", shipping_cost=12.00),
             self.factory(tags="lunares/rojos", description="zapatos", shipping_cost=0.00),
-            self.factory(attributes='"zapatos de campo", tono/oscuro', shipping_cost=9.00),
         ]
         unexpected_instances = [
-            self.factory(description="chanclas"),
-            self.factory(tags="azules"),
+            self.factory(description="chanclas", shipping_cost=100.00),
+            self.factory(tags="azules", shipping_cost=10.00),
         ]
 
         query_string = quote("zapatos rojos")
@@ -571,19 +568,17 @@ class ProductSearchTest(TestCase):
         self.assertEqual(response.status_code, 200)
         # load response data
         payload = response.json()
-        self.assertEquals(len(payload['products']), 2)
+        self.assertEquals(len(payload['products']), len(expected_instances))
 
     def test_anon_user_can_filter_discount_true(self):
         expected_instances = [
-            self.factory(tags="lunares/rojos", category='zapatos', description="zapatos verdes", discount=None),
             self.factory(tags="colores/rojos, tono/brillante", discount=100.00),
             self.factory(tags="lunares/azules", description="zapatos rojos", discount=12.00),
-            self.factory(tags="lunares/rojos", description="zapatos", discount=0.00),
             self.factory(attributes='"zapatos de campo", tono/oscuro', discount=9.00),
         ]
         unexpected_instances = [
-            self.factory(description="chanclas"),
-            self.factory(tags="azules"),
+            self.factory(description="chanclas", discount=0.00),
+            self.factory(tags="lunares/rojos", category='zapatos', description="zapatos verdes", discount=None),
         ]
 
         query_string = quote("zapatos rojos")
@@ -595,19 +590,17 @@ class ProductSearchTest(TestCase):
         self.assertEqual(response.status_code, 200)
         # load response data
         payload = response.json()
-        self.assertEquals(len(payload['products']), 3)
+        self.assertEquals(len(payload['products']), len(expected_instances))
 
     def test_anon_user_can_filter_discount_false(self):
         expected_instances = [
             self.factory(tags="lunares/rojos", category='zapatos', description="zapatos verdes", discount=None),
-            self.factory(tags="colores/rojos, tono/brillante", discount=100.00),
-            self.factory(tags="lunares/azules", description="zapatos rojos", discount=12.00),
+            self.factory(tags="lunares/azules", description="zapatos rojos", discount=0.00),
             self.factory(tags="lunares/rojos", description="zapatos", discount=0.00),
-            self.factory(attributes='"zapatos de campo", tono/oscuro', discount=9.00),
         ]
         unexpected_instances = [
-            self.factory(description="chanclas"),
-            self.factory(tags="azules"),
+            self.factory(description="chanclas", discount=100.00),
+            self.factory(tags="azules", discount=9.00),
         ]
 
         query_string = quote("zapatos rojos")
@@ -619,7 +612,7 @@ class ProductSearchTest(TestCase):
         self.assertEqual(response.status_code, 200)
         # load response data
         payload = response.json()
-        self.assertEquals(len(payload['products']), 2)
+        self.assertEquals(len(payload['products']), len(expected_instances))
 
     def test_anon_user_can_search_empty_string(self):
         expected_instances = [
@@ -628,8 +621,6 @@ class ProductSearchTest(TestCase):
             self.factory(tags="lunares/azules", description="zapatos rojos", discount=12.00),
             self.factory(tags="lunares/rojos", description="zapatos", discount=0.00),
             self.factory(attributes='"zapatos de campo", tono/oscuro', discount=9.00),
-        ]
-        unexpected_instances = [
             self.factory(description="chanclas"),
             self.factory(tags="azules"),
         ]
@@ -643,7 +634,29 @@ class ProductSearchTest(TestCase):
         self.assertEqual(response.status_code, 200)
         # load response data
         payload = response.json()
-        self.assertEquals(len(payload['products']), len(expected_instances) + len(unexpected_instances))
+        self.assertEquals(len(payload['products']), len(expected_instances))
+
+    def test_anon_user_can_filter_by_category(self):
+        expected_instances = [
+            self.factory(tags="lunares/rojos", category='ropa', description="zapatos verdes", discount=None),
+            self.factory(tags="lunares/rojos", category="ropa", discount=0.00),
+            self.factory(attributes='"zapatos de campo", tono/oscuro', category="ropa", discount=9.00),
+        ]
+        unexpected_instances = [
+            self.factory(description="chanclas", tags='rojos'),
+            self.factory(tags="zapatos/azules", category="deporte", description='rojos', discount=12.00),
+        ]
+
+        query_string = quote("zapatos rojos")
+        # discount=true
+        url = f"{self.endpoint}?query_string={query_string}&category=ropa"
+        # send in request
+        response = self.client.get(url)
+        # check response
+        self.assertEqual(response.status_code, 200)
+        # load response data
+        payload = response.json()
+        self.assertEquals(len(payload['products']), len(expected_instances))
 
 
 class MyProductsViewTest(APITestCase):
diff --git a/products/utils.py b/products/utils.py
index 3511021..0cfc28c 100644
--- a/products/utils.py
+++ b/products/utils.py
@@ -125,7 +125,7 @@ def find_related_products_v3(keyword):
     return set(products_qs)
 
 
-def find_related_products_v6(keyword, shipping_cost=None, discount=None):
+def find_related_products_v6(keyword, shipping_cost=None, discount=None, category=None):
     """
     Ranked product search
 
@@ -143,6 +143,10 @@ def find_related_products_v6(keyword, shipping_cost=None, discount=None):
         rank=SearchRank(vector, query)
     ).filter(rank__gt=0.05)     # removed order_by because its lost in casting
 
+    # filter by category
+    if category is not None:
+        products_qs = products_qs.filter(category=category)
+
     # filter for shipping cost
     if shipping_cost is True:
         # only instances with shipping costs
diff --git a/products/views.py b/products/views.py
index 262070a..96d34bd 100644
--- a/products/views.py
+++ b/products/views.py
@@ -152,6 +152,7 @@ def product_search(request):
       - offset: where to start counting results [OPTIONAL]
       - shipping_cost: true/false
       """
+      # capture query params
       query_string = request.GET.get('query_string', None)
       limit = request.GET.get('limit', None)
       offset = request.GET.get('offset', None)
@@ -171,6 +172,7 @@ def product_search(request):
                   discount = False
             else:
                   discount = None
+      category = request.GET.get('category', None)
 
       if query_string is None:
             return Response({"errors": {"details": "No query string to parse"}})
@@ -187,7 +189,7 @@ def product_search(request):
             # split query string into single words
             chunks = query_string.split(' ')
             for chunk in chunks:
-                  product_set = find_related_products_v6(chunk, shipping_cost, discount)
+                  product_set = find_related_products_v6(chunk, shipping_cost, discount, category)
                   # add to result set
                   result_set.update(product_set)
             # TODO: add search for entire phrase ???