diff --git a/themes/index.json b/themes/index.json
index 0d7a979..922bf1a 100644
--- a/themes/index.json
+++ b/themes/index.json
@@ -585,6 +585,52 @@
       "label": "norge festive"
     }
   ],
+  "Operating systems": [
+    {
+      "slug": "Operating systems/os-adwaita.yaml",
+      "label": "os adwaita"
+    },
+    {
+      "slug": "Operating systems/os-amiga.yaml",
+      "label": "os amiga"
+    },
+    {
+      "slug": "Operating systems/os-beos.yaml",
+      "label": "os beos"
+    },
+    {
+      "slug": "Operating systems/os-cupertino-graphite.yaml",
+      "label": "os cupertino graphite"
+    },
+    {
+      "slug": "Operating systems/os-cupertino.yaml",
+      "label": "os cupertino"
+    },
+    {
+      "slug": "Operating systems/os-elementary.yaml",
+      "label": "os elementary"
+    },
+    {
+      "slug": "Operating systems/os-fluent-dark.yaml",
+      "label": "os fluent dark"
+    },
+    {
+      "slug": "Operating systems/os-fluent.yaml",
+      "label": "os fluent"
+    },
+    {
+      "slug": "Operating systems/os-ios.yaml",
+      "label": "os ios"
+    },
+    {
+      "slug": "Operating systems/os-material-you.yaml",
+      "label": "os material you"
+    },
+    {
+      "slug": "Operating systems/os-system-7.yaml",
+      "label": "os system 7"
+    }
+  ],
   "Orange": [
     {
       "slug": "Orange/orange-charcoal.yaml",