--- /dev/null
+# color-hex-length
+
+Specify short or long notation for hex colors.
+
+```css
+a { color: #fff }
+/** ↑
+ * These hex colors */
+```
+
+The `--fix` option on the [command line](../../../docs/user-guide/cli.md#autofixing-errors) can automatically fix all of the problems reported by this rule.
+
+## Options
+
+`string`: `"short"|"long"`
+
+### `"short"`
+
+The following patterns are considered violations:
+
+```css
+a { color: #ffffff; }
+```
+
+```css
+a { color: #ffffffaa; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { color: #fff; }
+```
+
+```css
+a { color: #fffa; }
+```
+
+```css
+a { color: #a4a4a4; }
+```
+
+### `"long"`
+
+The following patterns are considered violations:
+
+```css
+a { color: #fff; }
+```
+
+```css
+a { color: #fffa; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { color: #ffffff; }
+```
+
+```css
+a { color: #ffffffaa; }
+```