--- /dev/null
+# selector-combinator-space-after
+
+Require a single space or disallow whitespace after the combinators of selectors.
+
+```css
+ a > b + c ~ d e >>> f { color: pink; }
+/** ↑ ↑ ↑ ↑ ↑
+ * These are combinators */
+```
+
+Combinators are used to combine several different selectors into new and more specific ones. There are several types of combinators, including: child (`>`), adjacent sibling (`+`), general sibling (`~`), and descendant (which is represented by a blank space between two selectors).
+
+The descendant combinator is *not* checked by this rule.
+
+Also, `+` and `-` signs within `:nth-*()` arguments are not checked (e.g. `a:nth-child(2n+1)`).
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be a single space after the combinators.
+
+The following patterns are considered violations:
+
+```css
+a +b { color: pink; }
+```
+
+```css
+a>b { color: pink; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a + b { color: pink; }
+```
+
+```css
+a> b { color: pink; }
+```
+
+### `"never"`
+
+There *must never* be whitespace after the combinators.
+
+The following patterns are considered violations:
+
+```css
+a + b { color: pink; }
+```
+
+```css
+a> b { color: pink; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a +b { color: pink; }
+```
+
+```css
+a>b { color: pink; }
+```