diff --git a/data/sitesEN.json b/data/sitesEN.json
index 2f1cd56..7989c2c 100644
--- a/data/sitesEN.json
+++ b/data/sitesEN.json
@@ -3411,6 +3411,24 @@
       "miraheze"
     ]
   },
+  {
+    "id": "en-undertaleyellow",
+    "origins_label": "Undertale Yellow Fandom Wiki",
+    "origins": [
+      {
+        "origin": "Undertale Yellow Fandom Wiki",
+        "origin_base_url": "undertaleyellow.fandom.com",
+        "origin_content_path": "/wiki/",
+        "origin_main_page": "Undertale_Yellow_Wiki"
+      }
+    ],
+    "destination": "Undertale Yellow Wiki",
+    "destination_base_url": "undertaleyellow.wiki.gg",
+    "destination_platform": "mediawiki",
+    "destination_icon": "undertaleyellowwiki.png",
+    "destination_main_page": "Undertale_Yellow_Wiki",
+    "destination_search_path": "/index.php"
+  },
   {
     "id": "en-unevendream",
     "origins_label": "Uneven Dream Fandom Wiki",
diff --git a/favicons/en/undertaleyellow.png b/favicons/en/undertaleyellow.png
new file mode 100644
index 0000000..52be2e7
Binary files /dev/null and b/favicons/en/undertaleyellow.png differ