diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index cfc02ed..6f79a55 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -628,6 +628,10 @@
 							$this->_field_data[$row['field']]['postdata'] = (is_bool($result)) ? $postdata : $result;
 						}
 					}
+					else
+					{
+						log_message('debug', "Unable to find validation rule: ".$rule);
+					}
 
 					continue;
 				}
@@ -1357,4 +1361,4 @@
 // END Form Validation Class
 
 /* End of file Form_validation.php */
-/* Location: ./system/libraries/Form_validation.php */
\ No newline at end of file
+/* Location: ./system/libraries/Form_validation.php */