provide more clear info what is going on

app/src/frontend/building/data-containers/planning.tsx

@@ -137,6 +137,10 @@ const PlanningView: React.FunctionComponent<CategoryViewProps> = (props) => {
         <DataEntryGroup name="Planning zones" collapsed={true} >
             <InfoBox type='success'>
             Data in this section comes from the Greater London Authority's Planning London Datahub. Please check the original GLA source when using for planning purposes.
+
+            You can use pink buttons to see boundaries of zones.
+
+            Information on whether specific building is in zone will be added automatically in future.
             </InfoBox>
             <LogicalDataEntry
             title="Is the building inside a flood zone?"