diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyControlFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyControlFrame.java
new file mode 100644
index 0000000000..2a7cf729c1
--- /dev/null
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyControlFrame.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2012 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.handler.codec.spdy;
+
+/**
+ * A SPDY Protocol Control Frame
+ */
+public interface SpdyControlFrame {
+    // Tag interface
+}
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyFrameEncoder.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyFrameEncoder.java
index 4f2bfbb44e..350a12f20f 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyFrameEncoder.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyFrameEncoder.java
@@ -75,17 +75,7 @@ public class SpdyFrameEncoder extends MessageToByteEncoder<Object> {
 
     @Override
     public boolean isEncodable(Object msg) throws Exception {
-        // FIXME: Introduce supertype
-        return msg instanceof SpdyDataFrame ||
-                msg instanceof SpdySynStreamFrame ||
-                msg instanceof SpdySynReplyFrame ||
-                msg instanceof SpdyRstStreamFrame ||
-                msg instanceof SpdySettingsFrame ||
-                msg instanceof SpdyNoOpFrame ||
-                msg instanceof SpdyPingFrame ||
-                msg instanceof SpdyGoAwayFrame ||
-                msg instanceof SpdyHeadersFrame ||
-                msg instanceof SpdyWindowUpdateFrame;
+        return msg instanceof SpdyDataFrame || msg instanceof SpdyControlFrame;
     }
 
     @Override
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyGoAwayFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyGoAwayFrame.java
index 2fc1de4791..ebc2a82bcc 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyGoAwayFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyGoAwayFrame.java
@@ -18,7 +18,7 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol GOAWAY Control Frame
  */
-public interface SpdyGoAwayFrame {
+public interface SpdyGoAwayFrame extends SpdyControlFrame {
 
     /**
      * Returns the Last-good-stream-ID of this frame.
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHeadersFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHeadersFrame.java
index 43ca4f289c..c0d53ad4b7 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHeadersFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHeadersFrame.java
@@ -18,7 +18,7 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol HEADERS Control Frame
  */
-public interface SpdyHeadersFrame extends SpdyHeaderBlock {
+public interface SpdyHeadersFrame extends SpdyHeaderBlock, SpdyControlFrame {
 
     /**
      * Returns the Stream-ID of this frame.
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyNoOpFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyNoOpFrame.java
index 54592c41cb..31b6e11a0b 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyNoOpFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyNoOpFrame.java
@@ -18,6 +18,6 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol NOOP Control Frame
  */
-public interface SpdyNoOpFrame {
+public interface SpdyNoOpFrame extends SpdyControlFrame {
     // Tag interface
 }
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyPingFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyPingFrame.java
index 4387732bb2..8a97479ed9 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyPingFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyPingFrame.java
@@ -18,7 +18,7 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol PING Control Frame
  */
-public interface SpdyPingFrame {
+public interface SpdyPingFrame extends SpdyControlFrame {
 
     /**
      * Returns the ID of this frame.
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyRstStreamFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyRstStreamFrame.java
index 03dfbcd447..4296d72df4 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyRstStreamFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyRstStreamFrame.java
@@ -18,7 +18,7 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol RST_STREAM Control Frame
  */
-public interface SpdyRstStreamFrame {
+public interface SpdyRstStreamFrame extends SpdyControlFrame {
 
     /**
      * Returns the Stream-ID of this frame.
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySettingsFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySettingsFrame.java
index 1f41e4b0fc..47e1d7b062 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySettingsFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySettingsFrame.java
@@ -20,7 +20,7 @@ import java.util.Set;
 /**
  * A SPDY Protocol SETTINGS Control Frame
  */
-public interface SpdySettingsFrame {
+public interface SpdySettingsFrame extends SpdyControlFrame {
 
     int SETTINGS_UPLOAD_BANDWIDTH               = 1;
     int SETTINGS_DOWNLOAD_BANDWIDTH             = 2;
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynReplyFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynReplyFrame.java
index 72f4017c01..c78a3ab0d8 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynReplyFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynReplyFrame.java
@@ -18,7 +18,7 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol SYN_REPLY Control Frame
  */
-public interface SpdySynReplyFrame extends SpdyHeaderBlock {
+public interface SpdySynReplyFrame extends SpdyHeaderBlock, SpdyControlFrame {
 
     /**
      * Returns the Stream-ID of this frame.
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynStreamFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynStreamFrame.java
index 82282b86ab..e670a0780b 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynStreamFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySynStreamFrame.java
@@ -18,7 +18,7 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol SYN_STREAM Control Frame
  */
-public interface SpdySynStreamFrame extends SpdyHeaderBlock {
+public interface SpdySynStreamFrame extends SpdyHeaderBlock, SpdyControlFrame {
 
     /**
      * Returns the Stream-ID of this frame.
diff --git a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyWindowUpdateFrame.java b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyWindowUpdateFrame.java
index 5e5fd7034f..d0fea74fdf 100644
--- a/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyWindowUpdateFrame.java
+++ b/codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyWindowUpdateFrame.java
@@ -18,7 +18,7 @@ package io.netty.handler.codec.spdy;
 /**
  * A SPDY Protocol WINDOW_UPDATE Control Frame
  */
-public interface SpdyWindowUpdateFrame {
+public interface SpdyWindowUpdateFrame extends SpdyControlFrame {
 
     /**
      * Returns the Stream-ID of this frame.