diff --git a/index.js b/index.js
index a156092..37f27f6 100644
--- a/index.js
+++ b/index.js
@@ -163,12 +163,10 @@ is.inRange = (x, range) => {
 
 is.infinite = x => x === Infinity || x === -Infinity;
 
-is.empty = value => {
-	return (
-		((is.string(value) || is.array(value)) && !value.length) ||
-		(!is.map(value) && !is.set(value) && is.object(value) && !Object.keys(value).length) ||
-		((is.map(value) || is.set(value)) && !value.size)
-	);
-};
+const isEmptyStringOrArray = x => (is.string(x) || is.array(x)) && x.length === 0;
+const isEmptyObject = x => !is.map(x) && !is.set(x) && is.object(x) && Object.keys(x).length === 0;
+const isEmptyMapOrSet = x => (is.map(x) || is.set(x)) && x.size === 0;
+
+is.empty = x => !x || isEmptyStringOrArray(x) || isEmptyObject(x) || isEmptyMapOrSet(x);
 
 module.exports = is;
diff --git a/readme.md b/readme.md
index e9b250a..8c9a29e 100644
--- a/readme.md
+++ b/readme.md
@@ -152,7 +152,7 @@ Check if `value` is `Infinity` or `-Infinity`.
 
 ##### .empty(value)
 
-Returns `true` if `value` is an empty string, array, object, map, or set.
+Returns `true` if `value` is falsy or an empty string, array, object, map, or set.
 
 
 ## FAQ
diff --git a/test.js b/test.js
index 39b1a50..336bc45 100644
--- a/test.js
+++ b/test.js
@@ -375,6 +375,12 @@ test('is.infinite', t => {
 });
 
 test('is.empty', t => {
+	t.true(m.empty(null));
+	t.true(m.empty(undefined));
+
+	t.true(m.empty(false));
+	t.false(m.empty(true));
+
 	t.true(m.empty(''));
 	t.false(m.empty('🦄'));