diff --git a/Apps/GeoDistanceApp/ReadMe.txt b/Apps/GeoDistanceApp/ReadMe.txt
index b2789c6e..88c7b256 100644
--- a/Apps/GeoDistanceApp/ReadMe.txt
+++ b/Apps/GeoDistanceApp/ReadMe.txt
@@ -8,3 +8,5 @@ This app requires MaxMind GeoIP2 database and includes the GeoLite2 version for
 For production usage, it is required that you purchase the GeoIP2 database from MaxMind (https://www.maxmind.com/) and use it. 
 
 To update the MaxMind GeoIP2 database for your app, download the GeoIP2-City.mmdb file and zip it. Use the zip file with the manual Update option.
+
+The app optionally also uses MaxMind ISP/ASN database which can be updated the with same method as above.
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