diff --git a/module/common/model.php b/module/common/model.php
index 779d3dfeef..525876f09e 100644
--- a/module/common/model.php
+++ b/module/common/model.php
@@ -2425,6 +2425,29 @@ EOD;
 
         return $menu;
     }
+
+    /**
+     * Process markdown.
+     *
+     * @param  string  $markdown
+     * @static
+     * @access public
+     * @return string
+     */
+    static public function processMarkdown($markdown)
+    {
+        if(empty($markdown)) return false;
+
+        $markdown = str_replace('&', '&', $markdown);
+
+        global $app;
+        $hyperdown = $app->loadClass('hyperdown');
+        $content   = $hyperdown->makeHtml($markdown);
+
+        $content = htmlspecialchars_decode($content);
+        $content = fixer::stripDataTags($content);
+        return $content;
+    }
 }
 
 class common extends commonModel
diff --git a/module/doc/control.php b/module/doc/control.php
index 71dd449b7a..550a0bb9c6 100644
--- a/module/doc/control.php
+++ b/module/doc/control.php
@@ -487,8 +487,8 @@ class doc extends control
 
         if($doc->contentType == 'markdown')
         {
-            $doc->content = $this->doc->processMarkdown($doc->content);
-            $doc->digest  = $this->doc->processMarkdown($doc->digest);
+            $doc->content = commonModel::processMarkdown($doc->content);
+            $doc->digest  = commonModel::processMarkdown($doc->digest);
         }
 
         /* Check priv when lib is product or project. */
@@ -916,8 +916,8 @@ class doc extends control
 
             if($doc->contentType == 'markdown')
             {
-                $doc->content = $this->doc->processMarkdown($doc->content);
-                $doc->digest  = $this->doc->processMarkdown($doc->digest);
+                $doc->content = commonModel::processMarkdown($doc->content);
+                $doc->digest  = commonModel::processMarkdown($doc->digest);
             }
         }
 
diff --git a/module/doc/model.php b/module/doc/model.php
index 942516d49f..1df41ba395 100644
--- a/module/doc/model.php
+++ b/module/doc/model.php
@@ -1947,25 +1947,4 @@ class docModel extends model
         if(!isset($treeMenu[$module->parent])) $treeMenu[$module->parent] = '';
         $treeMenu[$module->parent] .= '<li' . ($treeMenu[$module->id] ? ' class="closed"' : '') . '>' . $li . '</li>';
     }
-
-    /**
-     * Process markdown.
-     *
-     * @param  string  $markdown
-     * @access public
-     * @return string
-     */
-    public function processMarkdown($markdown)
-    {
-        if(empty($markdown)) return false;
-
-        $markdown = str_replace('&', '&amp;', $markdown);
-
-        $hyperdown = $this->app->loadClass('hyperdown');
-        $content   = $hyperdown->makeHtml($markdown);
-
-        $content = htmlspecialchars_decode($content);
-        $content = fixer::stripDataTags($content);
-        return $content;
-    }
 }