diff --git a/Controller.php b/Controller.php
index 25d4576..400e90b 100644
--- a/Controller.php
+++ b/Controller.php
@@ -43,6 +43,7 @@ class Controller extends \Piwik\Plugin\Controller
             "foregroundColor" => Common::getRequestVar('foregroundColor', "f00", 'string'),
             "lightColor" => Common::getRequestVar('lightColor', "222", 'string'),
         ];
+        $historicValue = Common::getRequestVar('historicValue', 0, 'int');
         try {
             if (!in_array($mode, $this->modes)) {
                 $modestring = implode(", ", $this->modes);
@@ -67,7 +68,7 @@ class Controller extends \Piwik\Plugin\Controller
                 $cache->save($cacheKey, $visitData, 60);
             }
             $text = $visitData[$mode];
-            $text = (int)$text;
+            $text = (int)$text + $historicValue;
             $errorMessage = false;
         } catch (\Exception $e) {
             $text = "Error";
diff --git a/README.md b/README.md
index 501e851..f32ef3d 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,9 @@ This plugin allows you to add an image showing the total amount of visits per `i
 ### Optional parameters:
 
 - `&mode=` one of `["nb_visits", "nb_actions", "nb_visits_converted", "bounce_count", "sum_visit_length", "max_actions", "bounce_rate", "nb_actions_per_visit", "avg_time_on_site"]` (responses from the `VisitsSummary.get` API)
-- `backgroundColor`: A hex color without the `#` (e.g. `f00` or `fe1234`)
-- `foregroundColor`
-- `lightColor`
+- `&backgroundColor=`: A hex color without the `#` (e.g. `f00` or `fe1234`)
+- `&foregroundColor=`
+- `&lightColor=`
+- `&historicValue=`: A number that is added to the value from Matomo before being displayed. Useful if you want to add data from a counter before starting to use Matomo.
 
 <img src="https://github.com/Findus23/plugin-ClassicCounter/blob/4.x-dev/screenshots/4909.png?raw=true" height="80">
diff --git a/plugin.json b/plugin.json
index 9017a6c..f67627e 100644
--- a/plugin.json
+++ b/plugin.json
@@ -1,7 +1,7 @@
 {
   "name": "ClassicCounter",
   "description": "Embed a view counter in the style of classic CGI scripts into your website",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "theme": false,
   "require": {
     "matomo": ">=4.0.0-b1,<5.0.0-b1"