diff --git a/README.md b/README.md
index 523dd67..ef66aa0 100644
--- a/README.md
+++ b/README.md
@@ -392,7 +392,7 @@ $promise->then(function (int $bytes) {
});
```
-## delay()
+### delay()
The `delay(float $seconds): void` function can be used to
delay program execution for duration given in `$seconds`.
@@ -421,7 +421,7 @@ same loop until the delay returns:
```php
echo 'a';
-Loop::addTimer(1.0, function () {
+Loop::addTimer(1.0, function (): void {
echo 'b';
});
React\Async\delay(3.0);
@@ -453,13 +453,13 @@ Everything inside this function will still be blocked, but everything outside
this function can be executed asynchronously without blocking:
```php
-Loop::addTimer(0.5, React\Async\async(function () {
+Loop::addTimer(0.5, React\Async\async(function (): void {
echo 'a';
React\Async\delay(1.0);
echo 'c';
}));
-Loop::addTimer(1.0, function () {
+Loop::addTimer(1.0, function (): void {
echo 'b';
});
@@ -481,13 +481,13 @@ promise will clean up any pending timers and throw a `RuntimeException` from
the pending delay which in turn would reject the resulting promise.
```php
-$promise = async(function () {
+$promise = async(function (): void {
echo 'a';
delay(3.0);
echo 'b';
-});
+})();
-Loop::addTimer(2.0, function () use ($promise) {
+Loop::addTimer(2.0, function () use ($promise): void {
$promise->cancel();
});
diff --git a/src/functions.php b/src/functions.php
index a3ce111..5a02406 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -384,7 +384,7 @@ function (mixed $throwable) use (&$rejected, &$rejectedThrowable, &$fiber, $lowL
*
* ```php
* echo 'a';
- * Loop::addTimer(1.0, function () {
+ * Loop::addTimer(1.0, function (): void {
* echo 'b';
* });
* React\Async\delay(3.0);
@@ -416,13 +416,13 @@ function (mixed $throwable) use (&$rejected, &$rejectedThrowable, &$fiber, $lowL
* this function can be executed asynchronously without blocking:
*
* ```php
- * Loop::addTimer(0.5, React\Async\async(function () {
+ * Loop::addTimer(0.5, React\Async\async(function (): void {
* echo 'a';
* React\Async\delay(1.0);
* echo 'c';
* }));
*
- * Loop::addTimer(1.0, function () {
+ * Loop::addTimer(1.0, function (): void {
* echo 'b';
* });
*
@@ -444,13 +444,13 @@ function (mixed $throwable) use (&$rejected, &$rejectedThrowable, &$fiber, $lowL
* the pending delay which in turn would reject the resulting promise.
*
* ```php
- * $promise = async(function () {
+ * $promise = async(function (): void {
* echo 'a';
* delay(3.0);
* echo 'b';
- * });
+ * })();
*
- * Loop::addTimer(2.0, function () use ($promise) {
+ * Loop::addTimer(2.0, function () use ($promise): void {
* $promise->cancel();
* });
*
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