@justinjhendrick - Thanks for pointing this out.  Also feel free to submit a PR and get credit for fixing :)
 @Scottmitch, I would but my company wants to review any open source before we contribute. So, something small like this wouldn't be worth the time necessary for a review.
 No worries I will fix it

> Am 18.07.2015 um 00:07 schrieb Justin Hendrick notifications@github.com:
> 
> @Scottmitch, I would but my company wants to review any open source before we contribute. So, something small like this wouldn't be worth the time necessary for a review.
> 
> —
> Reply to this email directly or view it on GitHub.
 Fixed by https://github.com/netty/netty/pull/4003

Documentation: wrong class mentioned in setter
{@link ByteBufAllocator} -> {@link MessageSizeEstimator} on
https://github.com/netty/netty/blob/4.0/transport/src/main/java/io/netty/channel/ChannelConfig.java#L248

this effects 4.0, 4.1, and master branches

transport/src/main/java/io/netty/channel/ChannelConfig.java
transport/src/main/java/io/netty/channel/ChannelConfig.java
diff --git a/transport/src/main/java/io/netty/channel/ChannelConfig.java b/transport/src/main/java/io/netty/channel/ChannelConfig.java
index b7ec03c45e1..7871285cd0c 100644
--- a/transport/src/main/java/io/netty/channel/ChannelConfig.java
+++ b/transport/src/main/java/io/netty/channel/ChannelConfig.java
@@ -245,7 +245,7 @@ public interface ChannelConfig {
     MessageSizeEstimator getMessageSizeEstimator();
 
     /**
-     * Set the {@link ByteBufAllocator} which is used for the channel
+     * Set the {@link MessageSizeEstimator} which is used for the channel
      * to detect the size of a message.
      */
     ChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator);
