diff --git a/CHANGELOG.md b/CHANGELOG.md
index 42eb1a2..454cad8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -60,7 +60,7 @@
 
 ## Security
 - Possible XSS prevented: Session cookie missed the "secure" and "httponly" flags
-- Proper check of uploaded files ([#152](https://github.com/flatpressblog/flatpress/issues/152), [#170](https://github.com/flatpressblog/flatpress/issues/170))
+- Proper check of uploaded files ([#152](https://github.com/flatpressblog/flatpress/issues/152), [#170](https://github.com/flatpressblog/flatpress/issues/170), [#217](https://github.com/flatpressblog/flatpress/issues/217))
 - Possible XSS prevented: Admin Area URL ([#153](https://github.com/flatpressblog/flatpress/issues/153))
 - Possible XSS prevented: Upload of misc. XML file types ([#172](https://github.com/flatpressblog/flatpress/issues/172), [#178](https://github.com/flatpressblog/flatpress/issues/178), [#188](https://github.com/flatpressblog/flatpress/issues/188))
 - Directory browsing prevented ([#174](https://github.com/flatpressblog/flatpress/issues/174))
diff --git a/admin/panels/uploader/admin.uploader.php b/admin/panels/uploader/admin.uploader.php
index e307479..ca3e813 100755
--- a/admin/panels/uploader/admin.uploader.php
+++ b/admin/panels/uploader/admin.uploader.php
@@ -99,7 +99,8 @@ class admin_uploader_default extends AdminPanelAction {
 			'svg',
 			'xml',
 			'md',
-			'pages'
+			'pages',
+			'xsig'
 		);
 
 		$imgs = array(