diff --git a/data/conf/parsedmarc/config.sample.ini b/data/conf/parsedmarc/config.sample.ini
index 443d3ce..5050546 100644
--- a/data/conf/parsedmarc/config.sample.ini
+++ b/data/conf/parsedmarc/config.sample.ini
@@ -21,6 +21,12 @@ save_forensic = True
 # and hence also speed up email processing.
 nameservers = 1.1.1.1,1.0.0.1
 
+# Disable using reverse DNS and geolocation. Will speed up
+# the processing noticably, but also reduce the variety and
+# precision of statistics.
+# Could be useful for troubleshooting/testing.
+offline = False
+
 # For best troubleshooting, toggle both booleans below.
 # If debug logging is needed (default)
 debug = False