diff --git a/common/src/main/java/io/netty/util/concurrent/CompleteFuture.java b/common/src/main/java/io/netty/util/concurrent/CompleteFuture.java
index 84376233dd..ed5755f572 100644
--- a/common/src/main/java/io/netty/util/concurrent/CompleteFuture.java
+++ b/common/src/main/java/io/netty/util/concurrent/CompleteFuture.java
@@ -140,6 +140,11 @@ public abstract class CompleteFuture<V> extends AbstractFuture<V> {
         return false;
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * @param mayInterruptIfRunning this value has no effect in this implementation.
+     */
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
         return false;
diff --git a/common/src/main/java/io/netty/util/concurrent/DefaultPromise.java b/common/src/main/java/io/netty/util/concurrent/DefaultPromise.java
index 6b175b2e5a..dc595cfa99 100644
--- a/common/src/main/java/io/netty/util/concurrent/DefaultPromise.java
+++ b/common/src/main/java/io/netty/util/concurrent/DefaultPromise.java
@@ -308,6 +308,11 @@ public class DefaultPromise<V> extends AbstractFuture<V> implements Promise<V> {
         return (V) result;
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * @param mayInterruptIfRunning this value has no effect in this implementation.
+     */
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
         if (RESULT_UPDATER.compareAndSet(this, null, CANCELLATION_CAUSE_HOLDER)) {
diff --git a/common/src/main/java/io/netty/util/concurrent/ScheduledFutureTask.java b/common/src/main/java/io/netty/util/concurrent/ScheduledFutureTask.java
index 05cba6b83a..6043d6ffec 100644
--- a/common/src/main/java/io/netty/util/concurrent/ScheduledFutureTask.java
+++ b/common/src/main/java/io/netty/util/concurrent/ScheduledFutureTask.java
@@ -151,6 +151,11 @@ final class ScheduledFutureTask<V> extends PromiseTask<V> implements ScheduledFu
         }
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * @param mayInterruptIfRunning this value has no effect in this implementation.
+     */
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
         boolean canceled = super.cancel(mayInterruptIfRunning);
diff --git a/transport/src/main/java/io/netty/channel/VoidChannelPromise.java b/transport/src/main/java/io/netty/channel/VoidChannelPromise.java
index bce765dbd1..c684843ebf 100644
--- a/transport/src/main/java/io/netty/channel/VoidChannelPromise.java
+++ b/transport/src/main/java/io/netty/channel/VoidChannelPromise.java
@@ -179,6 +179,11 @@ public final class VoidChannelPromise extends AbstractFuture<Void> implements Ch
         return false;
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * @param mayInterruptIfRunning this value has no effect in this implementation.
+     */
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
         return false;
diff --git a/transport/src/main/java/io/netty/channel/group/VoidChannelGroupFuture.java b/transport/src/main/java/io/netty/channel/group/VoidChannelGroupFuture.java
index e8fa84266b..740ac33702 100644
--- a/transport/src/main/java/io/netty/channel/group/VoidChannelGroupFuture.java
+++ b/transport/src/main/java/io/netty/channel/group/VoidChannelGroupFuture.java
@@ -138,6 +138,11 @@ final class VoidChannelGroupFuture implements ChannelGroupFuture {
         return null;
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * @param mayInterruptIfRunning this value has no effect in this implementation.
+     */
     @Override
     public boolean cancel(boolean mayInterruptIfRunning) {
         return false;