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-rw-r--r--user_guide/libraries/form_validation.html7
1 files changed, 7 insertions, 0 deletions
diff --git a/user_guide/libraries/form_validation.html b/user_guide/libraries/form_validation.html
index 7c544b69f..4400bac83 100644
--- a/user_guide/libraries/form_validation.html
+++ b/user_guide/libraries/form_validation.html
@@ -1038,6 +1038,13 @@ POST array:</p>
</tr>
<tr>
+ <td class="td"><strong>is_unique</strong></td>
+ <td class="td">Yes</td>
+ <td class="td">Returns FALSE if the form element is not unique in a database table.</td>
+ <td class="td">is_unique[table.field]</td>
+ </tr>
+
+ <tr>
<td class="td"><strong>valid_email</strong></td>
<td class="td">No</td>
<td class="td">Returns FALSE if the form element does not contain a valid email address.</td>