diff --git a/features/function.yml b/features/function.yml
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+++ b/features/function.yml
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+name: "@function"
+description: "The `@function` CSS at-rule defines a custom function that takes CSS values or custom properties as arguments, and returns a CSS value. It can be based on conditional logic such as by using the `@media` at-rule."
+spec: https://drafts.csswg.org/css-mixins-1/#function-rule
+group: css
+# No compat keys yet, this feature is planned to ship with Chromium 139
diff --git a/features/function.yml.dist b/features/function.yml.dist
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+++ b/features/function.yml.dist
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+# Generated from: function.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}