diff --git a/src/Liuggio/StatsdClient/Service/StatsdService.php b/src/Liuggio/StatsdClient/Service/StatsdService.php
index 061e351..8e7fa09 100644
--- a/src/Liuggio/StatsdClient/Service/StatsdService.php
+++ b/src/Liuggio/StatsdClient/Service/StatsdService.php
@@ -55,7 +55,7 @@ public function __construct(
 
     /**
      * Actually defines the sampling rate used by the service.
-     * If set to 0.1, the service will automatically discard 10%
+     * If set to 0.1, the service will automatically discard 90%
      * of the incoming metrics. It will also automatically flag these
      * as sampled data to statsd.
      *
@@ -68,7 +68,7 @@ public function setSamplingRate($samplingRate)
         }
         $this->samplingRate = $samplingRate;
         $this->samplingFunction = function($min, $max){
-            return rand($min, $max);
+            return rand($min, $max - 1);
         };
     }