diff --git a/composer.json b/composer.json
index 66083b2..d3569d0 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "php-ai/php-ml",
     "type": "library",
-    "description": "PHP Machine learning library",
+    "description": "PHP Machine Learning library",
     "license": "MIT",
     "keywords": ["machine learning","pattern recognition","computational learning theory","artificial intelligence"],
     "homepage": "https://github.com/php-ai/php-ml",
diff --git a/src/Phpml/Metric/Distance.php b/src/Phpml/Metric/Distance.php
index e0dce2d..1b92cef 100644
--- a/src/Phpml/Metric/Distance.php
+++ b/src/Phpml/Metric/Distance.php
@@ -23,8 +23,9 @@ class Distance
         }
 
         $distance = 0;
+        $count = count($a);
 
-        for ($i = 0; $i < count($a); ++$i) {
+        for ($i = 0; $i < $count; ++$i) {
             $distance += pow($a[$i] - $b[$i], 2);
         }