diff --git a/README.md b/README.md
index 2fe74f40..9234774e 100644
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+++ b/README.md
@@ -6,6 +6,10 @@
 
 1. Acquire source vector file.
 1. Simplify icon in vector editing tool (I use [Affinity Designer](https://affinity.serif.com/en-gb/)).
+   - Constrain within a 16x16 viewbox.
+   - Ensure there are no strokes.
+   - Simplify and minimise paths.
+   - Make all paths white.
 1. Export SVG.
 1. Run SVGO on the SVG file.
 1. Add object to [simple-icons.json](https://github.com/danleech/simple-icons/blob/gh-pages/src/simple-icons.json).