diff --git a/src/Changelog.php b/src/Changelog.php
new file mode 100644
index 0000000..c4bbd14
--- /dev/null
+++ b/src/Changelog.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Autodocs;
+
+class Changelog
+{
+    public string $monitoredPath;
+    public array $monitoredFiles = [];
+    public array $changedFiles = [];
+    public array $newFiles = [];
+    public function __construct(string $monitoredPath)
+    {
+        $this->monitoredPath = $monitoredPath;
+    }
+
+    public function capture(): void
+    {
+        $this->registerFiles($this->monitoredPath);
+    }
+
+    public function makeDiff(?string $monitoredPath = null): void
+    {
+        if (!$monitoredPath) {
+            $monitoredPath = $this->monitoredPath;
+        }
+        $previous = $this->monitoredFiles;
+        $this->registerFiles($monitoredPath);
+
+        foreach ($this->monitoredFiles as $index => $file) {
+            if (!array_key_exists($index, $previous)) {
+                $this->newFiles[] = $file;
+                continue;
+            }
+
+            if ($previous[$index]['md5'] != $file['md5']) {
+                $this->changedFiles[] = $file;
+            }
+        }
+    }
+
+    public function hasNewFiles(): bool
+    {
+        return count($this->newFiles) > 0;
+    }
+
+    public function hasChangedFiles(): bool
+    {
+        return count($this->changedFiles) > 0;
+    }
+
+    public function hasChanges(): bool
+    {
+        return $this->hasNewFiles() || $this->hasChangedFiles();
+    }
+
+    public function getChangesSummary(): string
+    {
+        if ($this->hasChanges()) {
+            return sprintf("%s files added and %s files changed.",
+            count($this->newFiles),
+            count($this->changedFiles)
+            );
+        }
+
+        return "No changes.";
+    }
+
+    public function registerFiles(string $monitoredPath): void
+    {
+        foreach (glob($monitoredPath . '/*') as $filename) {
+            if (is_dir($filename)) {
+                $this->registerFiles($filename);
+            }
+
+            $index = md5($filename);
+            $this->monitoredFiles[$index] = [
+                'path' => $filename,
+                'isDir' => is_dir($filename) ? "yes" : "no",
+                'md5' => is_dir($filename) ? $index : md5_file($filename),
+            ];
+        }
+    }
+}
diff --git a/src/Service/AutodocsService.php b/src/Service/AutodocsService.php
index 18cf62b..d0d0c0b 100644
--- a/src/Service/AutodocsService.php
+++ b/src/Service/AutodocsService.php
@@ -41,6 +41,13 @@ public function load(App $app): void
             }
         }
     }
+
+    /**
+     * Registers Json data feeds from cache dir
+     * @param string $identifier
+     * @param JsonDataFeed $dataFeed
+     * @return void
+     */
     protected function registerDataFeed(string $identifier, JsonDataFeed $dataFeed): void
     {
         $this->dataFeeds[$identifier] = $dataFeed;
@@ -73,15 +80,15 @@ public function registerPage(ReferencePageInterface $page): void
     public function buildPages(string $pages="all", array $parameters = []): void
     {
         $buildPages = explode(",", $pages);
+
         /** @var ReferencePageInterface $referencePage */
         foreach ($this->referencePages as $referencePage) {
             if ($pages === "all" || in_array($referencePage->getName(), $buildPages)) {
                 $referencePage->loadData($parameters);
                 $savePath = $this->config['output'] . '/' . $referencePage->getSavePath();
-                if (!is_dir(dirname($savePath))) {
-                    mkdir(dirname($savePath), 0755, true);
+                if(!$this->storage->hasDir(dirname($savePath))) {
+                    $this->storage->createDir(dirname($savePath));
                 }
-
                 $this->storage->saveFile($savePath, $this->builder->buildPage($referencePage));
             }
         }
diff --git a/src/Storage/FileStorage.php b/src/Storage/FileStorage.php
index f63170b..d421938 100644
--- a/src/Storage/FileStorage.php
+++ b/src/Storage/FileStorage.php
@@ -4,6 +4,18 @@
 
 class FileStorage implements StorageInterface
 {
+    public function createDir(string $path): void
+    {
+        if (!is_dir($path)) {
+            mkdir($path, 0755, true);
+        }
+    }
+
+    public function hasDir(string $path): bool
+    {
+        return is_dir($path);
+    }
+
     public function saveFile(string $path, string $content): void
     {
         file_put_contents($path, $content);
diff --git a/src/Storage/StorageInterface.php b/src/Storage/StorageInterface.php
index 701bb35..6058702 100644
--- a/src/Storage/StorageInterface.php
+++ b/src/Storage/StorageInterface.php
@@ -4,5 +4,9 @@
 
 interface StorageInterface
 {
+    public function hasDir(string $path): bool;
+
+    public function createDir(string $path): void;
+
     public function saveFile(string $path, string $content): void;
 }
\ No newline at end of file