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README.md

@@ -29,6 +29,13 @@ Available as github action. Automatically generate a new image at the end of the
 
     # list of files to generate.
     # one file per line. Each output can be customized with options as query string.
+    #
+    #  supported options:
+    #  - palette:     A preset of color, one of [github, github-dark, github-light]
+    #  - color_snake: Color of the snake
+    #  - color_dots:  Coma separated list of dots color.
+    #                 The first one is 0 contribution, then it goes from the low contribution to the highest.
+    #                 Exactly 5 colors are expected.
     outputs: |
       dist/github-snake.svg
       dist/github-snake.svg?palette=github-dark