diff --git a/src/Loop/InvalidWatcherException.php b/src/Loop/InvalidWatcherException.php
index 06360dd..80cdf7d 100644
--- a/src/Loop/InvalidWatcherException.php
+++ b/src/Loop/InvalidWatcherException.php
@@ -3,10 +3,11 @@
 namespace Interop\Async\Loop;
 
 /**
- * MUST be thrown if any operation (except cancel()) is attempted with an invalid watcher identifier. An invalid watcher
- * identifier is any identifier that is not yet emitted by the driver or cancelled by the user.
+ * MUST be thrown if any operation (except disable() and cancel()) is attempted with an invalid watcher identifier.
+ *
+ * An invalid watcher identifier is any identifier that is not yet emitted by the driver or cancelled by the user.
  */
-class InvalidWatcherException extends \LogicException
+class InvalidWatcherException extends \Exception
 {
 
 }
diff --git a/src/Loop/UnsupportedFeatureException.php b/src/Loop/UnsupportedFeatureException.php
index 03c8c9c..bfc93c7 100644
--- a/src/Loop/UnsupportedFeatureException.php
+++ b/src/Loop/UnsupportedFeatureException.php
@@ -3,11 +3,11 @@
 namespace Interop\Async\Loop;
 
 /**
- * Must be thrown if a feature is not supported by the system.
+ * MUST be thrown if a feature is not supported by the system.
  *
- * This might happen if PCNTL is missing and the loop driver doesn't support another way to dispatch signals.
+ * This might happen if ext-pcntl is missing and the loop driver doesn't support another way to dispatch signals.
  */
-class UnsupportedFeatureException extends \RuntimeException
+class UnsupportedFeatureException extends \Exception
 {
 
 }