--- /dev/null
+# at-rule-name-case
+
+Specify lowercase or uppercase for at-rules names.
+
+```css
+ @media (min-width: 10px) {}
+/** ↑
+ * These at-rule names */
+```
+
+This rule ignores `@import` in Less.
+
+Only lowercase at-rule names are valid in SCSS.
+
+The `--fix` option on the [command line](../../../docs/user-guide/cli.md#autofixing-errors) can automatically fix some of the problems reported by this rule.
+
+## Options
+
+`string`: `"lower"|"upper"`
+
+### `"lower"`
+
+The following patterns are considered violations:
+
+```css
+@Charset 'UTF-8';
+```
+
+```css
+@cHarSeT 'UTF-8';
+```
+
+```css
+@CHARSET 'UTF-8';
+```
+
+```css
+@Media (min-width: 50em) {}
+```
+
+```css
+@mEdIa (min-width: 50em) {}
+```
+
+```css
+@MEDIA (min-width: 50em) {}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+@charset 'UTF-8';
+```
+
+```css
+@media (min-width: 50em) {}
+```
+
+### `"upper"`
+
+The following patterns are considered violations:
+
+```css
+@Charset 'UTF-8';
+```
+
+```css
+@cHarSeT 'UTF-8';
+```
+
+```css
+@charset 'UTF-8';
+```
+
+```css
+@Media (min-width: 50em) {}
+```
+
+```css
+@mEdIa (min-width: 50em) {}
+```
+
+```css
+@media (min-width: 50em) {}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+@CHARSET 'UTF-8';
+```
+
+```css
+@MEDIA (min-width: 50em) {}
+```