diff --git a/ckeditor/ckeditor.d.ts b/ckeditor/ckeditor.d.ts
index f87ff2f17..f079d6960 100644
--- a/ckeditor/ckeditor.d.ts
+++ b/ckeditor/ckeditor.d.ts
@@ -552,9 +552,20 @@ declare module CKEDITOR {
 
 
     interface config {
-        startupMode: string;
-        removeButtons: string;
+        startupMode?: string;
+        removeButtons?: string;
         toolbar?: any;
+        skin?: string;
+        language?: string;
+        plugins?: string;
+        font_names?: string;
+        font_defaultLabel?: string;
+        fontSize_sizes?: string;
+        fontSize_defaultLabel?: string;
+        colorButton_enableMore?: boolean;
+        colorButton_colors?: string;
+        startupFocus?: boolean;
+        on?: any;
     }