diff --git a/src/Symfony/Component/Lock/StoreInterface.php b/src/Symfony/Component/Lock/StoreInterface.php
index 985c4476d7..a45c93aec9 100644
--- a/src/Symfony/Component/Lock/StoreInterface.php
+++ b/src/Symfony/Component/Lock/StoreInterface.php
@@ -43,7 +43,7 @@ interface StoreInterface
      *
      * If the store does not support this feature it should throw a NotSupportedException.
      *
-     * @param float $ttl amount of second to keep the lock in the store
+     * @param float $ttl amount of seconds to keep the lock in the store
      *
      * @throws LockConflictedException
      * @throws NotSupportedException
diff --git a/src/Symfony/Component/Lock/Tests/Store/BlockingStoreTestTrait.php b/src/Symfony/Component/Lock/Tests/Store/BlockingStoreTestTrait.php
index c04c01d64f..67ac4e1036 100644
--- a/src/Symfony/Component/Lock/Tests/Store/BlockingStoreTestTrait.php
+++ b/src/Symfony/Component/Lock/Tests/Store/BlockingStoreTestTrait.php
@@ -36,7 +36,7 @@ trait BlockingStoreTestTrait
      */
     public function testBlockingLocks()
     {
-        // Amount a microsecond used to order async actions
+        // Amount of microseconds we should wait without slowing things down too much
         $clockDelay = 50000;
 
         if (\PHP_VERSION_ID < 50600 || \defined('HHVM_VERSION_ID')) {
diff --git a/src/Symfony/Component/Lock/Tests/Store/ExpiringStoreTestTrait.php b/src/Symfony/Component/Lock/Tests/Store/ExpiringStoreTestTrait.php
index 10b1327387..9a0c5bd260 100644
--- a/src/Symfony/Component/Lock/Tests/Store/ExpiringStoreTestTrait.php
+++ b/src/Symfony/Component/Lock/Tests/Store/ExpiringStoreTestTrait.php
@@ -20,7 +20,9 @@ use Symfony\Component\Lock\StoreInterface;
 trait ExpiringStoreTestTrait
 {
     /**
-     * Amount a microsecond used to order async actions.
+     * Amount of microseconds used as a delay to test expiration. Should be
+     * small enough not to slow the test suite too much, and high enough not to
+     * fail because of race conditions.
      *
      * @return int
      */
@@ -34,7 +36,7 @@ trait ExpiringStoreTestTrait
     /**
      * Tests the store automatically delete the key when it expire.
      *
-     * This test is time sensible: the $clockDelay could be adjust.
+     * This test is time-sensitive: the $clockDelay could be adjusted.
      */
     public function testExpiration()
     {
@@ -71,14 +73,13 @@ trait ExpiringStoreTestTrait
     /**
      * Tests the refresh can push the limits to the expiration.
      *
-     * This test is time sensible: the $clockDelay could be adjust.
+     * This test is time-sensitive: the $clockDelay could be adjusted.
      */
     public function testRefreshLock()
     {
-        // Amount a microsecond used to order async actions
+        // Amount of microseconds we should wait without slowing things down too much
         $clockDelay = $this->getClockDelay();
 
-        // Amount a microsecond used to order async actions
         $key = new Key(uniqid(__METHOD__, true));
 
         /** @var StoreInterface $store */