--- a/package.json
+++ b/package.json
@@ -124,6 +124,14 @@
         "category": "Nix IDE",
         "command": "nix-ide.restartLanguageServer"
       }
+    ],
+    "semanticTokenScopes": [
+      {
+        "language": "nix",
+        "scopes": {
+          "*.withAttribute": ["markup.underline"]
+        }
+      }
     ]
   },
   "devDependencies": {