ignore unknownIdInLayout at monthly fragment

app/src/main/res/layout/fragment_month.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/calendar_holder"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
@@ -12,7 +13,8 @@
         layout="@layout/first_row"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_below="@+id/top_value"/>
+        android:layout_below="@+id/top_value"
+        tools:ignore="UnknownIdInLayout"/>
 
     <LinearLayout
         android:id="@+id/table_holder"