diff --git a/Custom-Images-Filename-Name-and-Subdirectory.md b/Custom-Images-Filename-Name-and-Subdirectory.md
index 4ab6221..2f76689 100644
--- a/Custom-Images-Filename-Name-and-Subdirectory.md
+++ b/Custom-Images-Filename-Name-and-Subdirectory.md
@@ -1,7 +1,10 @@
 > the following information is about the image filename and subdirectory name, not the `Paths for saving \ Output directories`
-### By default, the Web UI saves images in the output directories and output archive with a filename structure of
+### By default when Images filename pattern is blank, the Web UI saves images in the output directories and output archive with a filename structure of
+
+Images: `[number]-[seed]` or `[number]-[seed]-[prompt_spaces]`
+
+> the `[number]-` prefix is automatically added when [Add number to filename when saving](#add--remove-number-to-filename-when-saving) is enabled (default), it itself is not a [Pattern](#patterns).
 
-Images: `[number]-[seed]-[prompt_spaces]`
 ```
 01234-987654321-((masterpiece)), ((best quality)), ((illustration)), extremely detailed,style girl.png
 ```