--- /dev/null
+# font-family-no-missing-generic-family-keyword
+
+Disallow missing generic families in lists of font family names.
+
+```css
+a { font-family: Arial, sans-serif; }
+/** ↑
+ * An example of generic family name */
+```
+
+This rule checks the `font` and `font-family` properties.
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+```css
+a { font-family: Helvetica, Arial, Verdana, Tahoma; }
+```
+
+```css
+a { font: 1em/1.3 Times; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { font-family: Helvetica, Arial, Verdana, Tahoma, sans-serif; }
+```
+
+```css
+a { font: 1em/1.3 Times, serif; }
+```
+
+It's also *not* a violation to use a keyword related to property inheritance.
+
+```css
+a { font: inherit; }
+b { font: initial; }
+i { font: unset; }
+```
+
+It's also *not* a violation to use a generic font family anywhere in the list. In other words, the generic font name doesn't need to be the last.
+
+```css
+a { font-family: Helvetica Neue, sans-serif, Apple Color Emoji; }
+```