diff --git a/README.md b/README.md
index f68418b..076449d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # Network Layer for nRF24L01(+) radios
 
 Please see the full documentation at http://maniacbug.github.com/RF24Network/index.html 
+
+Update: Returntype of function update changed from void to bool.
+Advantage of this change: If there is through-trafic on a node you can act inside the sketch.
diff --git a/RF24Network.cpp b/RF24Network.cpp
index 07d438a..33f0317 100644
--- a/RF24Network.cpp
+++ b/RF24Network.cpp
@@ -50,14 +50,16 @@ void RF24Network::begin(uint8_t _channel, uint16_t _node_address )
 
 /******************************************************************/
 
-void RF24Network::update(void)
+bool RF24Network::update(void)
 {
   // if there is data ready
   uint8_t pipe_num;
-  while ( radio.available(&pipe_num) )
+  boolean has_message=false;
+  while ( radio.isValid() && radio.available(&pipe_num) )
   {
     // Dump the payloads until we've gotten everything
     boolean done = false;
+    has_message=true;
     while (!done)
     {
       // Fetch the payload, and see if this was the last one.
@@ -98,6 +100,7 @@ void RF24Network::update(void)
 #endif
     }
   }
+  return has_message;
 }
 
 /******************************************************************/
diff --git a/RF24Network.h b/RF24Network.h
index 4d599c4..7315c35 100644
--- a/RF24Network.h
+++ b/RF24Network.h
@@ -104,7 +104,7 @@ class RF24Network
    * This function must be called regularly to keep the layer going.  This is where all
    * the action happens!
    */
-  void update(void);
+  bool update(void);
 
   /**
    * Test whether there is a message available for this node