本家差分をmerge

Author: NEKOGET

classes/validation/validation.html

@@ -315,9 +315,9 @@ <h4 id="rules_table">ルール表</h4>
 						</tr>
 						<tr>
 							<th>valid_ip</th>
-							<td>(なし)</td>
+							<td><kbd>$flag</kbd> (optional)</td>
 							<td>
-								有効な IP アドレスかどうか。
+								Validates if the given input is a valid IP address. You can set <kbd>'ipv4'</kbd> or <kbd>'ipv6'</kbd> to <kbd>$flag</kbd> to check a specific IP address format.
 							</td>
 						</tr>
 						<tr>