diff --git a/syntax.json b/syntax.json
index 0dafe57..8d9a54a 100644
--- a/syntax.json
+++ b/syntax.json
@@ -812,5 +812,21 @@
         }
       }
     ]
+  },
+  {
+    "language": "Agda",
+    "markers": [
+      {
+        "type": "line",
+        "pattern": "--"
+      },
+      {
+        "type": "block",
+        "pattern": {
+          "start": "{-",
+          "end": "-}"
+        }
+      }
+    ]
   }
 ]