diff --git a/src/settings.h b/src/settings.h
index 3365ec3..1198503 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -10,7 +10,7 @@
 #define TOOL "ESP32-APRS-IS"
 #define VERS "0.1"
 // comment FILTER out to use no filter on the IS server: will display just LoRa received messages.
-// if FILTER is active: it will be used on login on IS server and will display received messages from server.
+// if FILTER is active: it will be used on login on IS server and will display received messages from server. More Info: http://www.aprs-is.net/javAPRSFilter.aspx
 //#define FILTER "r/48.29/14.29/25"
 
 #define SERVER "austria.aprs2.net"