Update grid.json

grid.json

@@ -284,6 +284,17 @@
                 14
             ],
             "color": "#808080"
+        },
+        {
+            "start": [
+                16,
+                8
+            ],
+            "end": [
+                16,
+                9
+            ],
+            "color": "#808080"
         }
     ]
 }