diff --git a/related_website_sets.JSON b/related_website_sets.JSON
index 4fedec5c..1a915126 100644
--- a/related_website_sets.JSON
+++ b/related_website_sets.JSON
@@ -1004,6 +1004,26 @@
       "rationaleBySite": {
         "https://zoom.com": "marketing new homepages for SEO purposes"
       }
+    },
+    {
+      "contact": "dimitar.andonov@gfk.com",
+      "primary": "https://sensic.net",
+      "associatedSites": [
+        "https://sensics.org"
+      ],
+      "rationaleBySite": {
+        "https://sensics.org": "Domain for test purposes."
+      }
+    },
+    {
+      "contact": "dimitar.andonov@gfk.com",
+      "primary": "https://sensics.org",
+      "associatedSites": [
+        "https://sensic.net"
+      ],
+      "rationaleBySite": {
+        "https://sensic.net": "The public demo homepage for GfK's media measurement product."
+      }
     }
   ]
 }