--- /dev/null
+# color-no-hex
+
+Disallow hex colors.
+
+```css
+a { color: #333 }
+/** ↑
+ * These hex colors */
+```
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+```css
+a { color: #000; }
+```
+
+```css
+a { color: #fff1aa; }
+```
+
+```css
+a { color: #123456aa; }
+```
+
+Hex values that are not valid also cause violations:
+
+```css
+a { color: #foobar; }
+```
+
+```css
+a { color: #0000000000000000; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { color: black; }
+```
+
+```css
+a { color: rgb(0, 0, 0); }
+```
+
+```css
+a { color: rgba(0, 0, 0, 1); }
+```