diff --git a/Source/Engine/UI/GUI/Common/RichTextBox.cs b/Source/Engine/UI/GUI/Common/RichTextBox.cs
index 8b2cc5cb3..3e89ed584 100644
--- a/Source/Engine/UI/GUI/Common/RichTextBox.cs
+++ b/Source/Engine/UI/GUI/Common/RichTextBox.cs
@@ -25,6 +25,9 @@ namespace FlaxEngine.GUI
             }
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RichTextBox"/> class.
+        /// </summary>
         public RichTextBox()
         {
             var style = Style.Current;