[ci skip] Correct a docblock following PR #3521
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index cfb13ae..f161b40 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -1452,7 +1452,7 @@
 	 * Value should be within an array of values
 	 *
 	 * @param	string
-	 * @param	array
+	 * @param	string
 	 * @return	bool
 	 */
 	public function in_list($value, $list)