diff --git a/Stopwatch.php b/Stopwatch.php
index 139d665..bf65ac3 100644
--- a/Stopwatch.php
+++ b/Stopwatch.php
@@ -57,11 +57,9 @@ public function getSections(): array
      *
      * @param string|null $id The id of the session to re-open, null to create a new one
      *
-     * @return void
-     *
      * @throws \LogicException When the section to re-open is not reachable
      */
-    public function openSection(string $id = null)
+    public function openSection(string $id = null): void
     {
         $current = end($this->activeSections);
 
@@ -81,11 +79,9 @@ public function openSection(string $id = null)
      *
      * @see getSectionEvents()
      *
-     * @return void
-     *
      * @throws \LogicException When there's no started section to be stopped
      */
-    public function stopSection(string $id)
+    public function stopSection(string $id): void
     {
         $this->stop('__section__');
 
@@ -149,10 +145,8 @@ public function getSectionEvents(string $id): array
 
     /**
      * Resets the stopwatch to its original state.
-     *
-     * @return void
      */
-    public function reset()
+    public function reset(): void
     {
         $this->sections = $this->activeSections = ['__root__' => new Section(null, $this->morePrecision)];
     }
diff --git a/StopwatchEvent.php b/StopwatchEvent.php
index 3bca2fd..4492d2d 100644
--- a/StopwatchEvent.php
+++ b/StopwatchEvent.php
@@ -116,10 +116,8 @@ public function lap(): static
 
     /**
      * Stops all non already stopped periods.
-     *
-     * @return void
      */
-    public function ensureStopped()
+    public function ensureStopped(): void
     {
         while (\count($this->started)) {
             $this->stop();