diff --git a/misc/.ExifTool_config b/misc/.ExifTool_config
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index 0000000..81c0382
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+++ b/misc/.ExifTool_config
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+%Image::ExifTool::UserDefined = (
+    # All EXIF tags are added to the Main table, and WriteGroup is used to
+    # specify where the tag is written (default is ExifIFD if not specified):
+    'Image::ExifTool::Exif::Main' => {
+        # Example 1.  EXIF:NewEXIFTag
+        0xd000 => {
+            Name => 'NewEXIFTag',
+            Writable => 'int16u',
+            WriteGroup => 'IFD0',
+        },
+        # add more user-defined EXIF tags here...
+    },
+    # new PNG tags are added to the PNG::TextualData table:
+    'Image::ExifTool::PNG::TextualData' => {
+### wyrde 2023-04-03
+#        # wyrde add 1.  PNG:Prompt
+       Prompt => { },
+#       # wyrde add 2,  PNG:Workflow
+       Workflow => { },
+#       # wyrde add 3.  PNG:Parameters
+       Parameters => { },
+#       # wyrde add 4,  PNG:SDpos
+       SDpos =>  { },
+#       # wyrde add 5.  PNG:SDneg
+       SDneg => { },
+#		# wyrde add 6.  PNG:SDconf
+       SDconf => { },
+    },
+	
+);
diff --git a/misc/README.md b/misc/README.md
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index 0000000..97245a1
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+++ b/misc/README.md
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+# misc files that don't fit elsewhere
+
+
+## .Exiftool_config
+a configuration file that adds some SD-related tags allowing exiftool to edit them. It can read the tags but cannot edit them until they are defined.
+### related:
+* https://exiftool.org/
+* https://github.com/hvdwolf/jExifToolGUI/releases
+
+## workping.py
+A CLI script for adding a workflow to a PNG file. Requres Pillow module (PIL). It updates the image file, make a backup if you want extra safety.
+python workping.py --image "/path/to/image.png" --workflow "/path/to/workflow.json"
+### related
+* source: https://colab.research.google.com/drive/1hQMjNUdhMQ3rw1Wcm3_umvmOMeS_K4s8?usp=sharing#scrollTo=llbal5zlANoH
+* PIL: https://pillow.readthedocs.io/en/stable/installation.html
+
diff --git a/misc/workping.py b/misc/workping.py
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+++ b/misc/workping.py
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+import argparse
+import os
+from PIL import Image, PngImagePlugin
+
+def make_workflow_png(image, workflow):
+    if not os.path.exists(image):
+        ValueError(f"Invalid image path `{image}`")
+    if not os.path.exists(workflow):
+        ValueError(f"Invalid workflow path `{workflow}`")
+    path = os.path.dirname(image)
+    filename = os.path.basename(image).rsplit('.', 1)[0]
+    try:
+        with open(workflow, "r") as file:
+            data = file.read()
+    except OSError as e:
+        Exception("There was an error reading the workflow JSON:", e)
+    image = Image.open(image)
+    info = PngImagePlugin.PngInfo()
+    info.add_text("workflow", data)
+    new_path = os.path.join(path, filename+'.png')
+    image.save(new_path, "PNG", pnginfo=info)
+    return new_path
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Add workflow metadata to a PNG image")
+    parser.add_argument("--image", type=str, help="Path to the PNG image")
+    parser.add_argument("--workflow", type=str, help="Path to the workflow JSON file")
+    args = parser.parse_args()
+    new_image_path = make_workflow_png(args.image, args.workflow)
+
+    print(f"Workflow added to `{new_image_path}`")