diff --git a/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java b/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java
index b8dd193d90..45ff2ed3b8 100644
--- a/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java
+++ b/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java
@@ -242,7 +242,7 @@ public class DefaultChannelFuture implements ChannelFuture {
         if (IoWorkerRunnable.IN_IO_THREAD.get()) {
             throw new IllegalStateException(
                     "await*() in I/O thread causes a dead lock or " +
-                    "sudden performance drop.");
+                    "sudden performance drop. Use addListener() instead.");
         }
     }
 
diff --git a/src/main/java/org/jboss/netty/channel/group/DefaultChannelGroupFuture.java b/src/main/java/org/jboss/netty/channel/group/DefaultChannelGroupFuture.java
index fc4ffd86b0..74ed7f2fb9 100644
--- a/src/main/java/org/jboss/netty/channel/group/DefaultChannelGroupFuture.java
+++ b/src/main/java/org/jboss/netty/channel/group/DefaultChannelGroupFuture.java
@@ -308,7 +308,7 @@ public class DefaultChannelGroupFuture implements ChannelGroupFuture {
         if (IoWorkerRunnable.IN_IO_THREAD.get()) {
             throw new IllegalStateException(
                     "await*() in I/O thread causes a dead lock or " +
-                    "sudden performance drop.");
+                    "sudden performance drop. Use addListener() instead.");
         }
     }