updated filter explanation

README.md

@@ -49,6 +49,7 @@ For example, here's a stupid little filter that just changes the destination IP
 
 ```python
 if packet.haslayer(ICMP):
+	log.info('Got an ICMP packet!')
 	packet.dst = '192.168.1.0'
 ```
 
@@ -59,6 +60,8 @@ Now to use the filter all we need to do is: ```python mitmf.py -F ~/filter.py```
 
 You will probably want to combine that with the **Spoof** plugin to actually intercept packets from someone else ;)
 
+**Note**: you can modify filters on-the-fly without restarting MITMf! 
+
 Examples
 ========