Fixes #515: Clarify when 'face' field is required

netbox/templates/dcim/device_import.html

@@ -83,7 +83,7 @@
 				</tr>
 				<tr>
 					<td>Face</td>
-					<td>Rack face; front or rear (optional)</td>
+					<td>Rack face; front or rear (required if position is set)</td>
 					<td>Rear</td>
 				</tr>
 			</tbody>