diff --git a/src/WebSocketCodec.php b/src/WebSocketCodec.php
index ed7c18a..fab998a 100644
--- a/src/WebSocketCodec.php
+++ b/src/WebSocketCodec.php
@@ -17,6 +17,20 @@ use React\Stream\WritableStreamInterface;
 class WebSocketCodec
 {
 
+    /**
+     * Encode a frame. Required keys are opcode and payload. Keys that can be passed are:
+     * 
+     *   opcode (int) - the opcode
+     *   final (bool) - final frame
+     *   rsv1-3 (bool) - reserved bits
+     *   masked (bool) - if the frame was masked
+     *   mask (string) - the mask bytes, if masked
+     *   length (int) - length of payload
+     *   payload (string) - the payload
+     * 
+     * @param array $frame The frame
+     * @return string The encoded frame
+     */
     public function encode(array $frame): string
     {
         // Encoded frame
@@ -82,21 +96,24 @@ class WebSocketCodec
             $encoded .= $frame['payload'];
         }
 
-        //$this->hexdump($encoded);
-
         return $encoded;
     }
 
     /**
      * Decode a websocket frame and return an array with the keys:
+     * 
      *   opcode (int) - the opcode
-     *   fin (bool) - final frame
+     *   final (bool) - final frame
      *   rsv1-3 (bool) - reserved bits
      *   masked (bool) - if the frame was masked
+     *   mask (string) - the mask bytes, if masked
      *   length (int) - length of payload
      *   payload (string) - the payload
+     * 
+     * @param string $frame The frame data to decode
+     * @return array The decoded frame
      */
-    public function decode($frame): array
+    public function decode(string $frame): array
     {
         // Decoded frame
         $decoded = [];
diff --git a/src/WebSocketConnection.php b/src/WebSocketConnection.php
index efac912..aa8ac17 100644
--- a/src/WebSocketConnection.php
+++ b/src/WebSocketConnection.php
@@ -25,8 +25,10 @@ class WebSocketConnection implements WebSocketInterface
     const OP_PING = 0x9;
     const OP_PONG = 0xA;
 
+    /** @var string|null The name of the group that this connection has joined, or null */
     private ?string $groupName = null;
 
+    /** @var WebSocketCodec The frame encoder/decoder */
     private WebSocketCodec $codec;
 
     private ?ConnectionGroup $group = null;
@@ -171,32 +173,50 @@ class WebSocketConnection implements WebSocketInterface
         return $this->request->getServerParams()['SERVER_ADDR'];
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function isReadable()
     {
         return $this->inStream->isReadable();
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function pause()
     {
         $this->inStream->pause();
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function resume()
     {
         $this->inStream->resume();        
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function isWritable()
     {
         return $this->outStream->isWritable();        
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function pipe(WritableStreamInterface $dest, array $options = array())
     {
         // TODO implement
         return $dest;
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function write($data)
     {           
         return $this->send(self::OP_FRAME_TEXT, $data);
@@ -225,12 +245,18 @@ class WebSocketConnection implements WebSocketInterface
         return true;
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function close()
     {
         $this->outStream->close();
         $this->inStream->close();
     }
 
+    /**
+     * {@inheritDoc}
+     */
     public function end($data = null)
     {