Update README.md

ssh4net · ssh4net · commit 67dd9b49b3f4 · 2023-05-15T16:34:41.000+09:00
diff --git a/README.md b/README.md
@@ -7,6 +7,7 @@ Usage
 Run Solidify.exe and drag&drop images into open window.
 Check console to progress information.
 
+Tool expecting RGBA image file. Output files will be write in same folder as a source with Source_file_name_fill.ext as RGB without alpha channel.
 
 License
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