diff --git a/html/forms/create-alert-item.inc.php b/html/forms/create-alert-item.inc.php
index a1ed1f5808..9efdef119d 100644
--- a/html/forms/create-alert-item.inc.php
+++ b/html/forms/create-alert-item.inc.php
@@ -23,6 +23,7 @@ $alert_id = $_POST['alert_id'];
 $count = mres($_POST['count']);
 $delay = mres($_POST['delay']);
 $mute = mres($_POST['mute']);
+$invert = mres($_POST['invert']);
 $name = mres($_POST['name']);
 
 if(empty($rule)) {
@@ -38,7 +39,12 @@ if(empty($rule)) {
     } else {
         $mute = false;
     }
-    $extra = array('mute'=>$mute,'count'=>$count,'delay'=>$delay_sec);
+    if($invert == 'on') {
+        $invert = true;
+    } else {
+        $invert = false;
+    }
+    $extra = array('mute'=>$mute,'count'=>$count,'delay'=>$delay_sec,'invert'=>$invert);
     $extra_json = json_encode($extra);
     if(is_numeric($alert_id) && $alert_id > 0) {
         if(dbUpdate(array('rule' => $rule,'severity'=>mres($_POST['severity']),'extra'=>$extra_json,'name'=>$name), 'alert_rules', 'id=?',array($alert_id)) >= 0) {
diff --git a/html/includes/modal/new_alert_rule.inc.php b/html/includes/modal/new_alert_rule.inc.php
index 38db25a045..d4d84f7b8b 100644
--- a/html/includes/modal/new_alert_rule.inc.php
+++ b/html/includes/modal/new_alert_rule.inc.php
@@ -99,6 +99,10 @@ if(is_admin() === false) {
             <div class='col-sm-2'>
                 <input type="checkbox" name="mute" id="mute">
             </div>
+            <label for='invert' class='col-sm-3 control-label'>Invert match: </label>
+            <div class='col-sm-2'>
+                <input type='checkbox' name='invert' id='invert'>
+            </div>
         </div>
         <div class='form-group'>
             <label for='name' class='col-sm-3 control-label'>Rule name: </label>
@@ -120,6 +124,7 @@ if(is_admin() === false) {
 <script>
 
 $("[name='mute']").bootstrapSwitch('offColor','danger');
+$("[name='invert']").bootstrapSwitch('offColor','danger');
 
 $('#create-alert').on('hide.bs.modal', function (event) {
     $('#response').data('tagmanager').empty();
@@ -161,6 +166,7 @@ $('#create-alert').on('show.bs.modal', function (event) {
             }
             $('#delay').val(delay);
             $("[name='mute']").bootstrapSwitch('state',extra['mute']);
+            $("[name='invert']").bootstrapSwitch('state',extra['invert']);
             $('#name').val(output['name']);
         }
     });
diff --git a/html/includes/print-alert-rules.php b/html/includes/print-alert-rules.php
index be3f679430..ce99291564 100644
--- a/html/includes/print-alert-rules.php
+++ b/html/includes/print-alert-rules.php
@@ -116,7 +116,11 @@ foreach( dbFetchRows($full_query, $param) as $rule ) {
 	echo "<tr class='".$extra."' id='row_".$rule['id']."'>";
 	echo "<td><i>#".((int) $rulei++)."</i></td>";
         echo "<td>".$rule['name']."</td>";
-	echo "<td><i>".htmlentities($rule['rule'])."</i></td>";
+        echo "<td>";
+        if($rule_extra['invert'] === true) {
+            echo "<strong><em>Inverted</em></strong> ";
+        }
+        echo "<i>".htmlentities($rule['rule'])."</i></td>";
 	echo "<td>".$rule['severity']."</td>";
 	echo "<td><span id='alert-rule-".$rule['id']."' class='glyphicon glyphicon-".$ico." glyphicon-large text-".$col."'></span> ";
         if($rule_extra['mute'] === true) {
diff --git a/html/includes/print-alerts.php b/html/includes/print-alerts.php
index 360da928e4..d1cf6b6b98 100644
--- a/html/includes/print-alerts.php
+++ b/html/includes/print-alerts.php
@@ -51,7 +51,7 @@ if(isset($device['device_id']) && $device['device_id'] > 0) {
     $sql = 'AND `alerts`.`device_id`=?';
     $param = array($device['device_id']);
 }
-$query = " FROM `alerts` LEFT JOIN `devices` ON `alerts`.`device_id`=`devices`.`device_id` RIGHT JOIN alert_rules ON alerts.rule_id=alert_rules.id WHERE `state` IN (1,2) $sql ORDER BY `alerts`.`timestamp` DESC";
+$query = " FROM `alerts` LEFT JOIN `devices` ON `alerts`.`device_id`=`devices`.`device_id` RIGHT JOIN alert_rules ON alerts.rule_id=alert_rules.id WHERE `state` IN (1,2,3,4) $sql ORDER BY `alerts`.`timestamp` DESC";
 $count_query = $count_query . $query;
 $count = dbFetchCell($count_query,$param);
 if(!isset($_POST['page_number']) && $_POST['page_number'] < 1) {
@@ -88,12 +88,18 @@ foreach( dbFetchRows($full_query, $param) as $alert ) {
 	echo "<td><i>".htmlentities($rule['rule'])."</i></td>";
         echo "<td>".$alert['hostname']."</td>";
 	echo "<td>".($alert['timestamp'] ? $alert['timestamp'] : "N/A")."</td>";
-	echo "<td>".$rule['severity']."</td>";
+	echo "<td>".$rule['severity'];
+        if($alert['state'] == 3) {
+            echo " <strong>+</strong>";
+        } elseif($alert['state'] == 4) {
+            echo " <strong>-</strong>";
+        }
+        echo "</td>";
         echo "<td>";
         if ($_SESSION['userlevel'] == '10') {
             $ack_ico = 'volume-up';
             $ack_col = 'success';
-            if($alert['state'] == 2) {
+            if(in_array($alert['state'],array(2,3,4))) {
                 $ack_ico = 'volume-off'; 
                 $ack_col = 'danger';
             }