diff --git a/doc/grammar-schema.json b/doc/grammar-schema.json
index f37cd983..916d5eff 100644
--- a/doc/grammar-schema.json
+++ b/doc/grammar-schema.json
@@ -31,6 +31,13 @@
       }
     },
 
+    "externals": {
+      "type": "array",
+      "items": {
+        "$ref": "#/definitions/rule"
+      }
+    },
+
     "conflicts": {
       "type": "array",
       "items": {
@@ -40,14 +47,6 @@
           "pattern": "^[a-zA-Z_]\\w*$"
         }
       }
-    },
-
-    "externals": {
-      "type": "array",
-      "items": {
-        "type": "string",
-        "pattern": "^[a-zA-Z_]\\w*$"
-      }
     }
   },