--- /dev/null
+# function-whitelist
+
+Specify a whitelist of allowed functions
+
+```css
+a { transform: scale(1); }
+/** ↑
+ * These functions */
+```
+
+## Options
+
+`array|string`: `["array", "of", "unprefixed", "functions" or "regex"]|"function"|"/regex/"`
+
+If a string is surrounded with `"/"` (e.g. `"/^rgb/"`), it is interpreted as a regular expression.
+
+Given:
+
+```js
+["scale", "rgba", "linear-gradient"]
+```
+
+The following patterns are considered violations:
+
+```css
+a { transform: rotate(1); }
+```
+
+```css
+a {
+ color: hsla(170, 50%, 45%, 1)
+}
+```
+
+```css
+a {
+ background:
+ red,
+ -webkit-radial-gradient(red, green, blue);
+}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { background: red; }
+```
+
+```css
+a { transform: scale(1); }
+```
+
+```css
+a {
+ color: rgba(0, 0, 0, 0.5);
+}
+```
+
+```css
+a {
+ background:
+ red,
+ -moz-linear-gradient(45deg, blue, red);
+}
+```