diff --git a/app/src/main/java/eu/faircode/email/IPInfo.java b/app/src/main/java/eu/faircode/email/IPInfo.java
index 844af77615..cf40bf99c3 100644
--- a/app/src/main/java/eu/faircode/email/IPInfo.java
+++ b/app/src/main/java/eu/faircode/email/IPInfo.java
@@ -72,6 +72,7 @@ public class IPInfo {
         }
 
         // https://ipinfo.io/developers
+        // Possible alternative: https://www.ip2location.io/ip2location-documentation
 
         //{
         //  "ip": "8.8.8.8",